Gotta give the guy props for taking a character that on paper could be one-note and predictable and bringing depth and character to it while remaining subtle and understated. Especially true in the later films where Spock had more flesh on his bones. No disrespect to the Shatner & company, who we all have genuine fondness for, but Kirk, Scotty, etc., were easier to play and other actors probably would have been just as good, but I can't think of anyone else who could have played Spock as well as Nimoy did.
Rest easy, Leonard, you did good in this world.
[Years ago I was covering BookExpo America, the largest annual American book show, and Nimoy was there plugging a photography book he'd done. He was scheduled to sign at the publisher's booth at a certain time, so me and other press guys went to take pix(BEA attracts a number of celebs, so he wasn't the only big name present). When he saw all of us with cameras he told the publicist he really didn't want any pictures taken. Here's a guy with a photo book who didn't want other photographers to take pix. The irony was so wonderful you had to laugh. I don't believe he was being egotistical. Despite his fame and place in the public eye he seemed shy.]