I always dread these scenes, because the way I write them feels a bit well...jumpy. Even when the transitions between actions are smooth, it feels like I'm writing a checklist rather than a fight scene. You know, character A did B then character B did C etc. Even when I try to write down a scene from a movie or something (especially hand to hand combat) it feels off somehow. I dread these scenes as much as I dread 'romantic' scenes, that's part of why I try to write stories that require a few of these scenes throughout. I won't get better at writing them if I don't get around to constructing them.