The acting, plot, dialogue, and effects were all on the money. With so many truly dreadful movies churned out, this was like a breath of fresh air.
I especially enjoyed the fact that no actor was annoying, something that often kills my experience of a film.
The few faults - Spock's voice is a tad too feminine. The Nimoy cameo was gratuitous and silly. The Klingons looked a little lame - should have gone with that old-time make up.