***SPOILERS(Although if the title didnt tell you that, I'm kind of diappointed in you)***
I'm greatly disappointed by Mass Effect 2 for one reason. Space.
No, not the infinite expanse kind, the "size of the game" kind. The so-called Space RPG with very little SPACE. Same as the first game, you visit few populated areas, and the ones you do fill up about 3 blocks worth of real estate. I'm supposed to be under the impression that space is huge, and the races are diverse, etc, but I never get that feeling because I'm constantly being confined to spaces where everyone is packed in tight. The "ship exploration from planet-to-planet" is okay, but it lacks the appeal that many RPGs do, in that you never start out small. In the old FF games, you start out walking, then get a boat, then a flying machine, and the flying machine gives you an idea of how big the area you are in was. There's no exploration progression in ME 2. It says, "Hey, here's a ship right away, go pretend to fly around space".
I will say, I just completed it today, and if you judge it by itself, its not a bad game by any means. But I feel we're too lenient when doling out "Perfection" ratings.