I dunno.. I usually can't play dull common builds. Not because I don't have the ability, I just don't LIKE to. I like to have a little flavor with my characters. Take, for instance, my latest - a high def sorc. 10+ in shiver armor, the rest in the lightning tree/FO. Courpsemourn for armor, along with a defiance merc and high def gear. I like characters that either have lots of minions, or have good killing or tank powers.
assasins, have some problems with necros to, not to mention wind druids, just can't play them.
I wouldn't say that I can't play any certain sort of character, but I find that I get extremely bored of almost any one-trick pony build. Pure hammerdins are entertaining, but I can't play them just to have fun, they're only useful for doing things. I'm currently building several one trick ponies - a frenzy barb, fury druid, bone necro, and orb sorc. All I expect will do well, and I also expect I will delete every last one before long, because I need something that does multiple things.
-melee assasins require godly gear to barely get by in pvm, trappers are boring
-sorcs are one trick ponies that are only good for mf
-necros are generic summoners or casters except they require godly gear if a caster
-shapeshift druids are boring, elemental druids are everywhere
all casters suck, all +skill item dependent, wow how fun......
I can't play any summoners at all, sitting back while they do everything is INCREDIBLY boring.
I've also never gotten an Amazon higher than level 20; The low level skills just never seemed to be enough. ...but then again, I've killed Ancients with a sorceress using only level 2 glacial spike and static