I found Hoshi to be more attractive, but whatever
I thought Hoshi was cute, for sure. On the rare occasion she brought her "sexy" out, she was downright hot.
So when are one of you going to start a Hoshi appreciation thread?
All in all, I can only conclude that Jolene Blalock has exactly zero acting talent, but for some reason, she was almost perfect as T'Pol... Go figure.
Well, obviously not literally
zero talent

since you have to have some talent to play at least one role well - even if you're playing yourself, you have to pretend that you're actually put in those situations...

but some actors have very limited range, and even though that makes them bad actors overall, they can be really perfect in a role that's tailor-made for them. Jolene Blalock was a Trek fan and a fan of Vulcans and Spock, maybe she related to a Vulcan character.
Some actors can turn any performance into gold, and some films are so badly written that even the greatest actors wouldn't be able to save them. For example, I'm a big fan of Peter Cushing, and he did some awful films in his last years, but he was always able to do something wonderful with the characters he played. But then you take a look at some of the drivel Olivier or Brando did late in life... probably not the performances they'd want to be remembered for.
There are some "roles of a lifetime" that will inspire an actor to do outstanding work... Ron Perlman as Vincent in
Beauty and the Beast, or James Marsters as Spike in
Buffy come to mind. Bakula probably considers Sam Beckett a tour-de-force role, and I would agree -- I thought he did terrific work on
Quantum Leap.
Personally, I think Blalock really grew as an actress over the course of
Enterprise, and was able to bring a lot of layers and subtlety to her performance. (I think you're onto something,
DevilEyes, about Blalock's admiration for Trek helping to inspire her performance.) Even the times when she herself said she had trouble getting a handle on T'Pol -- such as the trellium arc in Season 3 -- I thought she did a great job.
Hubby and I saw "Starship Troopers 3" last year, and for what it was -- a cheap knockoff sequel thing with no A-list actors -- we thought it was fun. We had a good time with it. There are plenty of gazillion-dollar movie-star-driven blockbusters out there that didn't entertain me at all.
Playing a Vulcan is undoubtedly a challenge for any actor-- look at the guest actors playing Vulcans, and the difficulties many of them had trying to make their characters interesting without becoming too emotional.