I mostly played 1.10.
Highest character was a lvl 89 Strafezon who could solo Diablo and do group Bhaalruns (on Hell). Cleglaw's Gloves (25% slow) and some anti-regeneration poison worked great.
Also had a 70s level Barbarian. No fun to play after Nightmare, you need insane weapons to hurt anything. And you constantly needed to repair them, ugh.
Had a Winddruid, found it funny but boring. Never really got into assassins. A Low-level (40s) Meteorb Sorceress was interesting but never really caught my attention.
My 2 favourite characters were the Skellemancer and the Frostadin. The Skellemancer could either get insane skelletons with +skills gear or walk around in full Magic Find gear and do squat (aside form the occassional curse).
The Frostadin is the coolest class in the game, any weapon becomes viable with it. I had a Frosty with some crushing blow boots and low-level weapon + life-draining rings. He could solo Bhaal and big groups of Cows at level 19 (to the chorus of "omfg hacker" ). Poinas "pwning with spirit" Diviner really brought back memories in that regard.