The beast races (Lizards and Cats). I can tolerate the Orcs simply because the Legions need meat shields and they do a good job, why send an obviously superior race like Imperials or Bretons to the front when you've got a perfectly good Orc...
Gah, Imperials, only good for talking. It's more like they're either afraid of dying, or afraid they'll make their pitiful combat skills glaringly obvious on the battlefield.
When it comes to fighting I'd rather have a Breton next to me, at least they have their entertaining parlour tricks.
And even then both races are about as culturally interesting as a builder's ass crack.
Who I hate? Those snobs with a weakness to axe-in-the-face, High Elves.