"You should always write for yourself, and your enjoyment. The readers come second."
Taking that into account, if you enjoy writing slightly over-the-top battles then you should write over the top battles. If you don't, well then don't. Some readers may not like it, if that's the case they'll either say something, or just go. However, there will always be people that like your style so if you feel like a change you may lose some readers, but you will defiantly gain some. Write for yourself, as long as you enjoy it, as that is the main thing.