Underrated:

Lost Planet Franchise (big money, big prizes, I LOVE IT!)...but seriously did you see that boss??!!
Lord of the Rings: War in the North (Snowblind Studios did a damn fine job and got shat on)
WarZ (despite all the crap talk, fun game and not nearly as many hackers as DayZ and more accessible)
Eufloria (probably the most overlooked puzzle game and better than the rest)
Sacred 2 (it was better than diablo 3, path of exile and torchlight 2, moved the genre forward unlike the rest)
Resident Evil 5 (co-op was *gasp* fun)



Overrated:

Dead Space Franchise (it's supposed to be sooooo good...o_O)
Call fo Duty Franchise (anything you can do battlefield does better, battlefield does everything better than you)
Scribblenauts (why people said for me to buy this, i'm not preteen *goes back to terraria*)
Bioshock Franchise (clearly a case of nostalgia)
Two Worlds 2 (wtf...just please "wtf", people said the first one sucked and this one was good, seriously wtf is this b.s. someone is smoking, anyone that has beaten this game will know what I speak of 0_0, the first one was better...I know , but it's true )

A couple of gems old schoolers should try out:

Jamestown (hello...old school shooter fans...hellooooooo)
And Yet it Moves (platforming genius)