The fact that such fights and battle scenes are difficult to follow is precisely the point. Real life conflict is chaotic and disorienting.
This seems a really strange thing to say given that very much about Star Trek is unrealistic, especially the space battles. Any "realism" will always take a backseat to the intent of the director. If the idea is to confuse the audience, then fine, that's his choice. But I think some are saying they prefer to not be confused or overwhelmed when it comes to something as simple as a space battle. I don't know if that is a majority opinion though. Maybe some people like to be overwhelmed with lasers and rockets and lens flares, oh my.