It was supposed to be pre- TOS stuff in Enterprise, so I'm thinking that it's a mix of both. The character was designed when Brannon and Braga wanted Vulcans to be "mean" toward humans trying to explore the galaxy. Idiotic in many ways.
That basis of her character in season 1, plus the fact that she lost her Vulcan membership or whatever in season 2...and the fact that they used her for all the "we need ratings lets take 75% of her clothes off" episodes, I'd say that alot of it was Brannon and Braga's bad writing.
Apparently, as an actress, she didn't like how alot of the show was handled, and she had alot of attitude on-set.
In terms ofh er as an actress...
Well, she didn't have that "I have knowledge and understanding" look like spock and tuvok. She was more "I'm looking at the situation and thinking, and I"m stuck up and giving advice that a fortune cookie can give" ish.
Spock was the best :P.
T'pol was more interesting than Tuvok as a character, but not as true to Vulcanism.
my 2 cents.
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