#7: Did you get placed in LP, or muted because of a bug? Too bad... NOTHING can/will be done.
#8: Does xp not show up? Do items now show in your inventory yet? Wait it out. This is usually due to server slowness.
#9: Does a game show as a loss(or win) when it should of been a win(or loss)? Wait it out. Sometimes time will fix this issue, and sometimes not. If not, just take it like a big boy(or girl)
#10: MMR is an internet point system. Do you REALLY care THAT MUCH about fake internet points that mean nothing?
#11: MMR does not matter. The longer the game takes to create, the more wide the MMR range. If you are 3k MMR, and it takes 1 minute to find a game, you will be placed with ~2k-4k MMR players. And please remember #10. *Edited 11 for more relevance
#12: Getting stomped in games? Check out reddit/dota2, or the chat channels and find some people to play with.
#13: People calling you bad when you play? Read guides on how to play your hero. Find friends willing to teach you how to play.
#14: People calling you bad when you play support? Are you buying wards? Pulling? Denying? Roaming? Not dying? Not stealing CS? If so, THEY are bad, not you. Mute them and move on.
#15: EVERY HERO HAS A COUNTER. EACH, AND, EVERY, ONE. Learn the counters to each hero, and pick accordingly.
#16: Want to get better? Watch pro-games. They are all over youtube. EDIT: Want to be a better support? ^ (Watching progames DOES help you get better. You learn juke spots, ward placement, and learn mechanics. Yes, you are copying other people play style, but you copying people who are good at the game.)
#17: Want to post a suggestion? Post it here if you want it to die and never be read, post it HERE: http://dev.dota2.com/ if you want it to ACTUALLY be read by a dev.