It might just be that people like seeing romance in movies. And honestly, it was a nice change of pace to have it be somebody other than Kirk.
Do you not think it dumbs down Spock to our level and makes him less interesting?
No. It makes his character arc an interesting allegory for "coming out" (like many other allegorical moments in Trek). Is it the most intelligent and moving such moment in film history (or even in Trek history)? No. But it was an interesting take on a character that I thought would prove the most difficult to do differently from the original.
I also think (my own speculation--no rumours or any other sources to back this up) that a lot of the flaws of the story (I have no complaints about the technical choices and effects used in the film--even the lens flares don't bother me a bit
