Or maybe it was because the script was so weak. He seemed amazingly emotional, which is odd as he seems to have consciously tried to swing back toward his Vulcan side since the time of the movies. No explanation was provided for this discrepancy. The plot seemed rather weak. First of all, I have a VERY hard time believing that the Romulans could take and hold Vulcan with only a few thousand troops.
Planets are BIG people.
Especially against the physical and mental powers of the Vulcans. Even had it appeared that Spock had given the ships his blessing, Spock left the Federation without a word and was suspected of defecting. I don't buy it. This is an idiot plot taken to new levels of absurdity. I still find it hard to believe that the Klingon ship could have hidden just about Romulus for so long without being detected.