Indeed, it is a huge negative impact, one in which there is a sense of anger, similar to Spock's anger at his mother's death in Trek 09. However, instead of Sarek to guide him, Kirk turns towards the nearest father figure, Admiral Marcus, who is not the best role model for Kirk to take advice from. Marcus' then uses Kirk's emotional unrest to his advantage, hoping to eliminate Khan and the Enterprise, all in one go, giving greater need for the Vengeance. Also, I do wish Sarek had been in there as well. I am hoping that he will be in 3, perhaps as part of a peace process between the Federation and the Klingons.