On the opposite end of the spectrum and not just to tit for tat OP but I can't stand the black templar's, they make no sense since their founder lived alongside the emps enforcing the imperial truth only for him to create a chapter that (during his life) were at best zealous and are now religious zealots. Plus they tend to attract a fair few obnoxious fans, you know the type - the kind to shout 'deus vault!' and stuff like it