I think that setup is viable. I don't see it being STRONG in PvP but it is workable..... not sure how well Melee classes are in PvP - I have always avoided them. I think you will face some serious issues with that.. mages are ranged and warrior needs to get in their face.

It really boils down to what you want to do really. PvP is tough and fast paced and all about burst damage. If you feel like you can do that then great Try it out and see really.