Just like Judd Apatow's other show, Freaks and Geeks, Undeclared is amazing and should never have been cancelled. The show is very well written, and each of the characters are realistic and well portrayed by the actors who play them. It is well worth purchasing the DVD's.
Also, Freaks and Geeks fans will love that most of the F&G actors have guest or recurring roles on the show, one of which (Seth Rogen) even having a starring role. If you liked Freaks and Geeks, you'll love Undeclared.