The average causal gamer doesn't though.
And most big reviews give 90+ to any major game made by ea or ubi regardless.
Hell spore got something lik98%
Spore got an average of something like 84%, as did a number of their other games. I agree about good PR though, it's surprisingly easy to tell people what they like.
However, out of all the platforms I would have thought PC gamers are more likely than anyone to do their research (excluding games like the sims and spore). I do hope the people don't put up with this. I haven't seen the Assassin's Creed II sales figures, but I'm sure there are enough people that don't care/don't understand though.