Spock was good as a half Vulcan, letting some of his human side through.This should be quite controversial: I think Tuvok was a better Vulcan character than Spock.
Much of Spock's characterisation was quite crude ("oh, this is one of your human emotions"), Tuvok's was more subtle. Spock acted as if he didn't understand emotions, Tuvok as if he was surpressing them largely, but was still able to understand. Spock was largely a machine, Tuvok a stoic.
Tuvok was the best full Vulcan, but Soval was also pretty good.