3 Which game had the least or most enjoyable character generation?
Not counting my own Presidents of the Apocalypse (since only a handful of people have ever played it and it's not yet available to the public), I think WotC's 4E Gamma World game had incredibly fun (and sorta silly) character generation. Does that count as D&D, though? I'm not sure if 4E counts as D&D in my opinion (YMMV, save the rancor for another time, please), so I'll include it here.
You make some random rolls rather than carefully crafting your perfect “build” and the results are comical yet cool in many cases. When we played it, I rolled up a “seismic doppelganger” which meant I could do lots of bashing/vibration damage to things on the ground, plus create doubles of myself that ran around causing trouble.
Random results tend to be more fun for me than flipping through rulebooks and supplements to build the perfect character (although I do enjoy that from time to time, too).