Try IGN DS.
So the reviews are plenty on this site. But remember: It's a matter of personal preference when it comes into the games you buy.
Take my situation for example. My favorite game had a rating of 3.5 (bad) from IGN. But I loved the game, because it's my personal choice! Take the critic's rating and reviews as mere advices, NOT direct orders.
Okay then, off you go!
EDIT: Here's my favorite game that got a 3.5. I give it a 9.3. IGN is a creep for giving this game a low rating since they can't handle the difficulty of the game.
So you see, trust your personal preference, as some critics give out pointlessly low scores."it's ridiculously difficult in certain areas"
"it eventually ends up being too difficult"
"The biggest problem is just how *bleep* difficult it is"