There are some great games available for Android devices, it depends largely in what your into though.
Personally I'm playing, Dead Trigger 2, Star Wars Tiny Death Star, Doctor Who: Legacy, Angry Birds Star Wars and Riptide GP 2 on my phone. Grand Theft Auto Vice City and San Andreas on my Nexus 7.
There are others like Marvel Run Jump Smash!, Where's my Water, Crazy Taxi, The Walking Dead: Assault, Subway Surfers, The Room, Asphalt 8: Airborne, True Skate, Tiny Thief, Hell Yeah: Pocket Inferno, Alien Breed, Robot Unicorn Attack and many, many more.
It's worth checking sites like Android Police, Android Central and Android Authority because they regularly have round ups of games released.
I'd also recommend checking Google Play Games which should already be on your tablet.
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