After watching the DVDs, here is my overly detailed episode-by- episode breakdown of Season 2. After breaking it down like this, I can see why some people prefer Season 1 to 2. There is an awful lot of "filler" down there. Season 1 may have fewer Must See episodes, but also a lot fewer Filler episodes.
Bus S2 had ten (for me) mind-blowing episodes. That's quite a feat.
Must See Television (10) - Episodes that I annoy my non-Community-watching friends with
Epidemiology
Cooperative Calligraphy
Conspiracy Theories and Interior Design
Abed's Uncontrollable Christmas
Advanced Dungeons and Dragons
Intermediate Documentary Filmmaking
Critical Film Studies
Paradigms of Human Memory
Fistful of Paintballs
For a Few Paintballs More
Quality Television (4) - Strong though not transcendent episodes
Basic Rocket Science
Messianic Myths and Ancient Peopls
Aerodynamics of Gender
Mixology Certification
Adequate Filler (8) - Not firing on all cylinders, maybe one plot line falls flat or a single sequence elevates it
Anthropology 101
Accounting for Lawyers
Asian Population Studies
Custody Law and Eastern European Diplomacy
Celebrity Pharmacology
Early 21st Century Romanticism
Intro to Political Science
Applied Anthropology and Culinary Arts
Misses, Near and Far (2) - Episodes I will likely skip in the future
The Psychology of Letting Go
Competitive Wine Tasting