Did you think it was clever or did you think it was cheesy? Did it add to the film or did it completely take you out of it? Just a basic survey.
Did I enjoy the scene? Yes
Was I surprised to see it? Yes
Do I think the movie would've been fine without it? Yes
Did it take me out of the movie? No
Did I think Spock had a good send-off in the last movie (esp. with the narration of the original opening words)? Yes
Do I expect to see Nimoy in the next one? No
Do I think Nimoy and most everyone else involved liked the scene? Yes, esp. since I remember an interview where Nimoy said he didn't think he gave his best performance in his final scene with Quinto in the '09 film.
Pure fan service. Would the writers have written a scene in which he contacts Prime-Spock about a bad guy called Nebulon or somthing?
Quinto's Spock may very well have contacted Nimoy's Spock about Nebulon in-universe, but since Prime Spock would have no info we (the audience) would not see that interaction as it would not be relevant.