Mass Effect's biggest problem is the combat system and AI that barely can check - so expect no help from your peers in some battles. The combat system feels awkward to use and to move from protection to protection is quite complicated, and that caregivers often stand in the way of.
The game has a story that many players seem to like. Everyone that I talked to and played this game seems to love the game, though I was personally never incredibly impressed. The game's story is okay, though the story is not exactly deep or have anything to do with what humanity is going through right now.
There exists no planets outside the main quest and maps to these is something that not even 12 year old amatörmoddare would drop. BioWare should be ashamed of these outdoor areas!
However, this is obviously criticism that can be overlooked if you like space opera of epic proportions. Self, I give the game the score Barely Pass, to emphasize that not everyone will like this game even though it's incredibly popular.