You're making me feel like an idiot, because I recently bought ME2 for the PS3 after Amazon dropped the price. Though I haven't played it yet. But I don't have a 360, and my PC isn't powerful enough for it so this was my only option.
Like I said, the PS3 version isn't a
terrible way to play Mass Effect 2, though I did find the QA on the title to be rather suspect with numerous crashes I never ran into on 360 (not to mention the
really terrible bugs on one of the Overlord DLC mission, where your ship can fly and sink right through terrain). It was a good game on the 360, and it's a good game on PS3. But it's a far
better game on 360 (and PC) since you can import your Mass Effect 1 data, and you do yourself a disservice by playing the definitively lesser version. But if you're not going to buy a 360, the PS3 version is certainly serviceable.
To make it worse, the default Shephard in Mass Effect 2 is a Renegade. So when you import your 5 Mass Effect 1 comic choices on the PS3 version, all the
other choices in the game are either forgotten altogether or defaulted to Shephard being a dick. Characters who should be warm and inviting to you as an old friend with a long history are sometimes more cold and distant than they'd otherwise be. As someone who routinely plays Paragon-type characters, that really rubbed me the wrong way when I played the PS3 version.