My opinion, and my previous writing with combat, it can be flashy so long as it is realistically flashy. That meaning, if you use a unique form of combat that not many use generally. For example I use to have an Imperial spellsword who fenced, and wielded a Masterforge Steel fencing blade(not a Rapier). The overall idea though, is to not act like the untouchable Neveraine/Dragonborn/Champion Of Cyrodil. Flashy is all based on your combat form, but combat is true to it's form, realistic within a fantasy setting for it's mechanics and style.