He actually IS Spock, just as much as Nimoy is Spock.
Oh is he? How so?
Well... so far Quinto hasn't written a book claiming that he
isn't Spock.
But he seemed to inhabit a believable Spock sort of range. His voice is far softer, and higher pitched, than Nimoy's sonorous baritone, so there are some technical limitations. Thankful that he didn't try to sound deeper.
"Technical limitations." That's a good way to put it. Frankly, I tend to put more emphasis on sound than looks, which may be part of why Quinto is a harder sell for me than for others.
I wonder if there's some new Hollywood trend towards higher voices. That seemed to be a frequent divergence between the new cast & the old cast. Not only was Quinto missing Nimoy's sonorous baritone but also John Cho wasn't anywhere close to George Takei's trademark congestion. And Simon Pegg's Scottish accent reminded me less of James Doohan and more of Dr. Carson Beckett, the high-pitched worry-wart from
Stargate Atlantis.
So Tim Russ played an excellent Spock, too...
That's something else I found about Quinto's performance. While he was somewhere on the outskirts of "a believable Spock sort of range," I felt he was further from the Nimoy bullseye than Tim Russ' Tuvok or Mark Lenard's Sarek, and they weren't even trying to play
exactly the same character that Nimoy was.