In the PvP community there is very little reason to not be a Vampire, to some degree even on Stam based characters. An argument can be made the benefits outweigh the negatives in every category.
I thought a Vampire Hunter would be a great idea. Make it set or a skill line which is a real threat to Vampires damage wise. or even Daedric Glyphs again. The game is best when it is a game of choices, not one Meta that everyone copies. I would even say give it a glow like Imperial Physique.... but I think something like that with the old Sheild Breaker mentality (you know, you sell out to be effective against one meta) would be a really great challenge for the PvP Community