Let me be the first to start.
Angry Birds. OK, I understand this is a fun addicting game but I'm sick of how people think that it is the best game ever, I mean sure it is really fun, but the best ever ?!
Need For Speed. High price, terrible controls and no storyline! (enough said)
Osmos. You probably never heard of this game. which is a shame because it's really great game.
Glasstower1/2. Great game with great graphics and plot. It may be in top downloads or some thing. But my not one of my 17 friends (with iPhone/iPod Touch) ever HEARD of it.
Post here games that YOU think they're underrated/overrated.