I think you're missing the point of reviews.
part of the point, beyond the score, is for you to judge if the game is what you want. how? by reading the review, and coming to your own conclusion on if it's a good or bad one, or simply if you want to buy the game or not. you can read a review and not totally agree with them. you can take one point, that it's a rehash, or that the graphics aren't very improved, or that the controls aren't very tight, or that it's really short, and come to the decision as to whether or not it's something you'd be interested in.
if you only want to play animal crossing for a week, again, i think you're missing the whole point of the game, but that's your decision totally. i'm just confused as to why you would want to rent a game that's supposed to be played in short bursts over months, instead of hours and subsequently complain about the game. if you're saying it's the same as wild world, totally agree, but if you're saying the gameplay is bad, you're not playing it the right way, and it's probably not your kind of game. for some people, it's really enjoyable. again, it's their opinion.