Nope, I have thought the same thing. I have also noticed that some people call the new Dante for bad nicknames, but they aren't calling Dante from Dante's Inferno for something else than Dante. The only reason I can come up with is that they are doing it on purpose due to childish manners.
Anyways, the switching between Light and Dark powers isn't something new in gameplay. There are many other games who have done this before, more recent one being Dante's Inferno, but I can understand why people would be on the fence about it in this new Devil May Cry game. I mean, this is Dante, once just half-demon and now suddenly having new angelic powers in this new interpretation on him. There are reasons to ask questions and we have yet to have them answered, so I hope there is a good explanation in the game's storyline.