I bought it on launch. I haven't been playing is steadily enough to get anywhere though. Bioware games do that for me, they don't get addictive till the story gets dramatic, which is usually the final half. Same with Dragon Age, but I gave up there when I just could not get past the undead in Redcliffe, which is like the first freaking mission too. That game is hard.
The only really bad thing about ME2 is the size and color of the ingame text. When I target something, the description is a blue blob. The menus are clear but tiny. Not enough of the population have HDTV's yet. They're starting to make assumptions that people who play these games should already have one. Too much money for me.