I got this for half off during the Steam sale and it still feels like I paid too much. The old Win3.1/95 version is better than this version in every respect.
Here are the problems with this newer version:
* No netplay. I knew this when I bought it, so it didn't bother me particularly much, but it's still absurd for a fundamentally multiplayer game.
* It only allows up to 4 players. The old Windows version allowed up to 6, and some other versions, including the rules for the board game, allowed up to 8 (though frankly 8 is too many). Considering the crazy AI (more on that below), though, this is probably just as well.
* You cannot initiate multi-way trades. You can only trade one person at a time.
* You can only conduct business (trading, buying houses, etc.) on your turn. You are supposed to be able to do it whenever you like. (In real life it's better etiquette to wait your turn anyway, but occasionally strategic/tactical concerns trump etiquette.) You do at least have the option of conducting business after your roll -- unless your roll lands you in jail, in which case your turn ends immediately.
* Auctions are turn-based, which is not the case in the original game. This can very easily change the outcome of an auction. (To be fair, it would be quite difficult to implement a non-turn-based auction in hotseat multiplayer -- but how many people are really going to be playing hotseat multiplayer games?)
* Ridiculous AI. They will make trades with each other that are absurd if each player is playing for himself -- and that make perfect sense if all the AIs are on the same "team", trying to screw over the human player. They also constantly pester you with one-sided trades that you would have to be insane to accept. If you turn down the difficulty, it will tone down but not stop this behavior.
* Despite all the "house rules" options (none of which I find interesting), there is no option to use the "speed die", which is included in all standard Monopoly sets since 2007 or 2008. This is a shame because it's one of the few rule changes that actually enrich the strategy of the game.
* The "short game" rules for the original are not included either. It can be approximated using the House Rules, but you can't enforce a time limit. As I understand it, the original "short game" rules were removed a few years ago -- but they were replaced by the "speed die" rules, which, again, are not present either.
* The "manage" interface mode sucks. I want to be able to see the whole board and click on the squares I'm interested in. (You can do this anyway much of the time, but occasionally you're forced to use this interface, for instance if you're trying to buy a property.)
* It doesn't support 1920x1080, which I believe has been the most popular resolution on Steam for a couple of years now. It's just as well, though, because even at at 1600x900, everything seems too small. I just play at 1366x768.
* The music is completely forgettable, unlike the memorable and catchy tunes from the old Windows version.
So, all in all, this is a worse adaptation of the game than one that's nearly two decades old. WTF?