I've never really seen the big deal about angled/centered weapons. I can understand having hands that correspond, but what's wrong with having centered and angled weapons in the same wad? It's not like a real person would hold all his weapons pointing straight forward.
That is somewhat true, but the inconsistency of angled/non-angled weapons in the same wad can be just a bit bothersome, I will admit...
Unless you're going for the whole ironsight thing, where you have angled weapon sprites and centered sprites for the same weapon, the centered sprites being used for when you aim the weapon using the iron sights... then it's not really a problem, but I don't see many weapons that have angled and centered sprites for them at the same time.