Cumberbatch is a great actor but in the trailers all he does is snarl in a black trenchcoat and blow stuff up. I doubt he'll compete with Winn, Dukat, Weyoun and Female Changeling in terms of great Trek villains.
The movies tend to be big, dumb, loud Hollywood blockbusters so lack the nuance I like in Trek. The best "villain" in the movie series is V'ger. An unknown, alien being that opens up philisophical questions. That we've de-evolved from that to fucking Eric "FIRE EVERYTHING!" Bana blowing planets up for no reason is a sad state of affairs.
Please, his reason is so obvious you'd have to be dead not to notice it.
The "devolution" started and stopped with TWOK. That's the blueprint for Trek's on screen success. They've been trying to recapture that for decades. Looks like they finally did, in spades.