Valve opened the gates for poorly ported titles from consoles or just re-releases of old PC games which are added as new games without the original date, bad mobile ports and Early Access titles without any restrictions how long a game can be early access whatsoever and no quality control at all. Personally i love Steam, i chose it because it gives me many advantages as a PC gamer and is very convenient to use and that it always improves is awesome. But recently i'm not so sure if it was a good idea choosing it as my main gaming platform anymore.
Why isn't there any quality control whatsoever?
Valve has enough money to open another office or development studio which only checks games befor release and could potentially use it to port older games for newer hardware and OS's like GOG.com does. Also the Greenlight system is easy to abuse, another reason why quality control is very important. There are games which got greenlit just because of nice screenshots but the actual games are utterly broken or unfinished.
Here are a few examples of greenlit games which released broken or unfinished (not saying they are necessarely bad games):http://store.steampowered.com/app/259640/http://store.steampowered.com/app/242800/http://store.steampowered.com/app/221020/
Personally i like the Greenlight system, it gives every indy developer the chance to get a release on Steam. However, just because it got greenlit doesn't mean it can be released in any state they please. The same goes for games released by publishers with their poorly made console ports, mobile ports and unfinished games like X: Rebirth, this needs to stop! There needs to be a standart of quality and a standart of guidlines here! Also just adding a report button and a space for community reviews is not enough and not what i see as actual quality control if its only handled by the community. Its actually kind of ridiculous to be honest. Offering refunds like Origin and GOG.com does would be a very good start and would solve many of these issues. Begs the question; why is there a report button for games but refunds are barely allowed? Then there are these re-releases of old games which are not separated from the actual new releases at all and their original release dates are not shown as well which makes things even more complicated. There needs to be a way to separate them easely for example with a new tab for "Classics new on Steam" or a checkbox so the old re-releases are not shown anymore and only the actual new ones are visible if checked in the "New Releases" tab. Its very unfair for new games if they are pushed out of the spotlight just because some publisher decided to release 10 games of their "classics" in a row.
Here some informative videos about this subject to underline my points (i know he has his very own way to represent his opinion but he has very good points):https://www.youtube.com/watch?v=LaC4NGikmT4
And this one by TotalBiscuit about the layout of the storepage and the recent massive releases of low quality and old games. Also very interesting for people who think every game should be on Steam and who think it doesn't matter how bad they are:https://www.youtube.com/watch?v=sLNh5HPbQPo
Why are there no restrictions for Early Access titles?
First of all i have nothing against Early Access, i actually think its a great idea but as it is now it needs improvement, just to make that clear so there isn't any missunderstanding. Anyway, it seems like every second game is an Early Access title on Steam nowadays. I think this exists to justefy the unfinished releases Steam was getting, mostly from Greenlight games, but this isn't the right way (implying the importance of quality control here again, Early Access is just a lazy way to deal with it)! First of all Early Access games SHOULDN'T be on the same storepage as finished games! There should be a separate storepage only for Early Access titles, its unfair for finished titles to get pushed away by unfinished games just because they have a "wacky" concept but then there seems to be no sign when these games get actually finished or even made. I know these games would sell less but thats the point, many people are not aware of this program and buy these games anyway. Its not really their fault since Early Access games are not well separeted from finished games. Also if this continues and more games get released in this state because they get away with it then this could be the next standart which is BAD. Also like i mentioned befor, what keeps the developers away for not finishing their games at all? There should be limit for the state for being Early Access of 1-2 years, this would ensure that the games wouldn't be in Early Access forever, that the games would be in a more playable state and get actually finished and so devs aren't almost completely free of criticism anymore. Also people who bought Early Access games should know how development is going and what their plans are in great detail since they paid for it to be part of development and to test their unfinished products on their PC's.
Here a informative video about this subject to underline my suggestions and arguments:https://www.youtube.com/watch?v=CyGbbIB5eaM
This one as well! It also applies to the firsr point about quality control:https://www.youtube.com/watch?v=IiHH-X6SUrI
Why is there still Third-Party-DRM on Steam?
I know this is kind of beating a dead horse but i wanted to adress this anyway because there is no point in Third-Party-DRM since Steam is a form of DRM already! I know that would be a big mess for games which are for a while on Steam now to change the DRM policy but this could be changed and restricted for future releases. Why do i need something like a trojan virus like program Securerom which only allows me 5 installs if its bought over Steam and can't be lend or copied anyway? Whats the point in using GFWL, Uplay or Rockstar's Social Club for games i bought over Steam if i'm using Steam already? These other gaming clients come not even CLOSE to Steam and they not even try since their only goal is to control their customers other than actually making a good and enjoyable gaming platform and often these "services" (if you even can call them like this) keep me away from playing my games because they have often issues, this never happened with Steam for me btw. Also for example GFWL is about to shut down, what happens to the games which use this service and didn't made the fully transition to Steam? Am i then forced to crack these games? That would be ridiculous! Another reason why these Third-Party-DRM have to go!
If you agree with this post then please share your support and if not then tell me why. I can adjust this post later after reading some feedback. English isn't my first language, i'm sorry for any spelling errors, i did my best to correct them. Cheers!
*I edited the OP a bit after some "feedback".