Many ideas that I have never seen done anywhere else, self aware of tropes, breaking the 4th wall, pretty funny, clever, and hilarious at times, highly original, great diverse effed up characters. My favorite and who makes the show so unique: Abed. I'm a very big geek when it comes to tv, film, pop culture, music, games etc. so I can definitely relate to him. Sad to see some characters leave the show, but who knows, maybe for the better so they can introduce some new crazy, quirky ones.
Most of 4 seasons, some of S5, need to see web ep and S6 (13-14, July-August 2015) KDOC, NBC