Ferengi yes, but I don't think Vulcans have been particularity stereotyped - aside from humans, they are probably the most multifaceted race in the Trek universe - with a huge range of motives, and breadth of 'emotion' (ironically). Romulans are pretty well treated too. Poor portrayal of a human: "Allah uh Akbar, Allah uh Akbar! I'm an Arab, look at my Gadaffi sunglasses, Arafat scarf, and Saddam hat. I SHOOT YOU! Death to the infidels!" Good portrayal of a human: "Good morning." I think people are confusing 'cultural idiosyncrasies' (fine) with 'poor charcterisation' (not fine) - portraying every Klingon with that same ridiculous arrogant growling personality is horrendous - mentioning logic a lot if you are a Vulcan is not, so long as you are written three dimensionally, and don't harp on too much. Basically, when it comes to Klingons, we are talking about poor drama / poor writing, to be blunt. It seems racially selective - some aliens are done better than others - Klingons are probably the worst portrayed after TNG - other species aren't so badly handled. Good Klingon portrayal: Bad Klingon portrayal: Pretty much everything after Heart of Glory lol. Every scowling, rasping, one dimensional, needlessly confrontational, tiresome lot.