It's not just you. All of the air of Sephiroths cold and ruthless demeanor were virtually stricken from this game. And I know they'll be people who'll come back with the "well this is before he turned evil" comments and whatnot, but in the original game he was shown before he went nuts as well. In fact, that was the most screen time he had in the game. And if you remember, while not overly a bad person, he was shown to have a coldness to him. Kinda the guy you wouldn't want to approach if he was sitting in the corner by himself. The tension his character presented was completely non-existent in Crisis Core.
But then again, they decided to focus on Count Gackt anyway. So it's all kind of a moot point.