Details like this one also play a part in the visual style of a game, and in my eyes those somersaults better fit to other genres.
I actually agree with you on that point, although my opinion might change once I play the game. I still think it's just details though, as with almost everything graphical. They make the experience much better but they are not essential for incredible gameplay. I simply believe that if you don't like a simple detail as the jumping animation, it would be sad that you miss what could potentially be a great game overall because of it. The somersault will not make the dialogues bad, or the story stupid.