Hey now, not all Dunmer are mean, the ones in Oblivion (aside from Valen Dreth) were actually very friendly.
I somewhat agree. The dunmer are sneaky yet friendly in Cyrodiil, but the natives can go [censored] themselves. They're rude, shade, blinded by the Tribunal, and I'm strongly against owning slaves. Their "necromantic" practices with their relatives are questionable, but at least it's kept within the family.
Lorewise, their fighting style has to be my favorite. Aside of excelling at everything, they're described as proficient enchanters and marksmen who are not trusted among the other races. The chimer origin and history is friggin' awesome, and they look the coolest as a neutral magic/stealth character, which I am in every game, only a different race.