Excellent game - action packed, smooth gameplay, great graphics. An awesome story which keeps unravelling to an epic finalle - which all happens in an all explorable Arkham island. The island isn't massive yet packed with amazing things to do.
I would have to say the combat system is the best feature of this game - simple yet very very effective. It can't get old.
GOTY edition comes with all released DLCs so an extra added bonus!