This is one the main points against this movie I've seen and having now just watched it, I have to agree. Quinto does a terrible spock. In fact I found it difficult watching any of the actors play the original characters. I would have preferred it if they had made a new Star Trek with new characters because the inevitable comparisons drag this movie down.
If you know your trek, Vulcans DO have emotions, much stronger than humans in fact. they realised it was leading them down a dangerous path with weapons like Psionic Resonators. That was the time the 'Logic religion' took off. They are taught from a very young age to suppress their emotions. You can argue Quinto played it too 'human', but he's supposed to be half-human and the other Vulcans expect him to have less emotion discipline. I think Quinto put in a good performance.
If you need to know why, remember this film was supposed to 'appeal to a wider audience'. it was NOT made for Trek fans.
But he's even more emotional than many human societies like the Japanese. He was raised in a reserved society that values emotional restraint yet has little. He even talks and shows too much pda with Uhura.
Global Warming, it's a personal decision innit? - Nigel Tufnel
Maybe too emotional....but we are seeing a much younger Spock. Perhaps he got better at suppressing his emotions as he matured. How old is Spock supposed to be in this movie? Mid-20s maybe? In the original series I thought Spock was in his mid-30s.
In my opinion Quinto pulls off a great Spock. I can see that just basing it off this one movie though, he comes off too emotional. The big difference (to me) is that Nemoy's Spock was a regular through the entire run of Star Trek (original tv series) and movies so he had much more time to convey the typical Vulcan's control over emotion. If you removed all you knew of Nemoy's Spock and watched him in Wrath of Khan only, I'd say the emotion is on Par between the two actors.
Zachary is an awesome Spock and I like seeing he can go human when pushed too far; but it should be an occasional thing. Not something done every movie.