If you have Ares as a patron, can you still be deemed "Wiccan" or would you have to be Pagan?

Of course you can. Don't listen to the fluffies, they generally have no grasp on the "dark" or other unsavory aspects of the divine. Ares has never been one of the Gods I have felt pulled to, but if he works for you then more power to you. I also tend to work with more "dark" deities, so do many others, so you're not alone.