I bought was given Mass Effect 2 for my birthday this weekend, played it for the first time last night.
So far, it's been highly deserving of the 9.5/10 it received from OXM. The action feels much more like a FPS than an RPG, though it has a lot of qualities RPG fans will think highly of. Your decisions, I can already tell, shape the story in a big way.
Some cons, however minor. The text is smallish and difficult to read, which makes little sense to me. I'm playing on a giant-ass TV and struggle to read it. No, my picture's not the best in the world, but I've yet to have a problem on other games.
Also, and this was mentioned in a review or two, it has a tendency to freeze. Last night, in just a couple of missions worth of playing, it froze/glitched three times. Twice I got stuck and had to load from last save, and once an enemy froze in midair. Thanks to autosave, the last save wasn't too far back, but it's still an annoyance.
Overall, very pleased. Gameplay is great, and if you're thinking of picking it up, I would say do it.
Another point, and this is less of a knock than just an observation: It's very cinematic. By that, I don't mean it has pretty cutscenes, I just mean there are a lot of them, at least so far. The missions are pretty long, and there's no "I'll just sit down and play for a few minutes."