Each version of D&D has its pros and cons. Some aspects of the system are great, while others are much less so. Today I found myself thinking about the various editions, some of the things I liked most about them, and some of the things I liked least.
Here we go...
Loved - Light rules with plenty of room for the GM, the classic modules, Nostalgia, the Cavalier class, combat tends to move quickly, historical inspirations, Gary Gygax
Loathed -Poorly organized rulebooks, descending armor class, demihuman racial limits
AD&D 2nd Edition
Loved - flavor and feel, character class descriptions, non-weapon proficiencies, Nostalgia, historical inspirations
Loathed - THACO, descending armor class, superfluous supplemental books with no eye for game balance, demihuman racial limits
D&D 3rd Edition
Loved - Improved saving throw system, modular design, improved skill system, feats and other factors allowed for more customizable characters, online SRD, classes well balanced while maintaining their individuality
Loathed - Out of Control Multiclassing and/or Prestige classes, wildly unbalanced supplemental books, the removal of weapon proficiencies
Loved - Encourages team play, less work for the DM
Loathed - Dissociated mechanics, classes are too balanced and loses a lot of flavor, overabundant player options (almost 3,000 feats and counting!), skill challenges, healing surges, rules poorly organized in PHB
That's just what I could think of off the top of my head.
What are your favorite and least favorite things about each edition of D&D?