Game Informer has reviewed Mass Effect for the Xbox 360 and the news is good. In short, the magazine thinks Mass Effect is one of the best games ever made. In particular, the magazine lauds the game's storyline and compelling characters. The review praises the game, noting that it has a deep and rich universe easily on par with Star Wars, even noting that it is "the next big franchise for science fiction junkies to latch onto." More importantly, the review notes that Mass Effect represents "a huge step forward for video games" and that it "rings in a new age of interactive storytelling."
The only downside of the game seems to be the combat, which is apparently hampered by balance problems and wonky AI. The review notes that the combat certainly isn't a deal breaker, and that it's still fun to play, but it's not quite on par with the grand universe present in the rest of the game.
All in all, Game Informer gives it a 9.75. How exactly one equates a game's deficiencies to a value of 0.25 we don't know, but we're sure the team at BioWare is pretty damned pleased (as are their new overlords, no doubt). Keep an eye out for the full review in the latest issue of Game Informer.