I recently got Mass Effect for PC but my poor machine doesn't have the horsepower to run it.
you poor bastard- you just "bought" a game that you can only install 3 times before you have to answer to
these guys. also ME sucks. i don't care how many glowing reviews it got; it is terrible. the combat is boring repetitive Gears Of War style thoughtless nonsense. the menu & item systems are unintuitive and lack any kind of useful descriptions. the skills & special abilities only vaguely affect gameplay and are mostly useless (at least in Knights Of The Old Republic you could actually use some of the force powers in combat - in ME the equivalents are completely unnecessary). the weapons are also entirely ghey and it doesn't take long to realize that the assault rifle is the only valid weapon. when you find an item, there is no way to know what its use is until
after you've decided to pick it up. there are not enough alien species. when you gain access to the universe you will be amazed at the sheer number of planets, but that joy will quickly dissipate when you find that ~20% of them are explorable.
i will concede that ME is a very pretty game that does have some cool features (eg: after combat the game saves you a lot of time by auto-looting all dead enemies). the main story line is ok, but ALL sidequests are pointless and way too time-consuming. some more bad things: the stupid vehicle you keep having to drive refuses to obey the laws of physics; different responses to some questions or situations will often lead to the same results (wtf?); the "hacking" minigame is just as retarded as the one in Bioshock; and perhaps what irritated me the most was the level layouts for every sidequest were EXACTLY the same. seriously. you enter some cave and it is exactly like the last three caves, only filled with different enemies. inexcusable imo.
but i only played through 60-75% of the game before uninstalling it, so maybe it gets totally awesome at the 80% mark

I would like to get Diablo III when it comes out but I refuse to pay for it. It just feels like giving money to the guy that sells crack to everyone in your neighborhood at this point. The crack-dealer being Blizzard and the crack being WoW, of course.
you are j/k here, right?