I think Vampires are ok the way they are now for the most part.
Those who are upset with Vampires, what is Bethesda to do?
If you want Skyrim's Vampires to be true to lore, are you prepared to be 100% a social pariah? NEVER to step foot inside a town or talk to another living person ever again?
Because Unike Cyrodiil Vampires, (who could only remain human looking if they fed because of a special pact with Clavicus Vile), Skyrim Vampires would look like 100% wild beasts 100% of the time regardless if you fed or not.
So are the Cyrodiilic vampires in Skyrim or not? What do YOU think?
People keep pulling out the "But but but-oh, but the Skyrim vampire appearance never change when well-fed, so they must be Volkihar!"
I think Bethesda didn't want to make different vampire faces. I mean, if they look the same in stage 1 and stage 4(Blood-starved) how does a person realize the vampire is a vampire when he looked the same all this time?
NPC: "Hey, your skin is as pale as the snow. You afraid of sunlight or something?"
Vampire: "I looked like this yesterday....

"
Few hours pass byNPC: "Don't like those eyes you got. There's a bad hunger to them."
Vampire: "Ive always had these eyes!

"
Day four without blood arrives."Whoa, his eyes are red, he is pale. He has fangs. Oh and the script tells us to attack him. Come on everyone, lets go burn the vampire."
It's pretty much how Skyrim is. In Oblivion, we had stages like in Skyrim. We fed on sleeping people like in Skyrim. Yet we don't change facial appearances. It's more an error than anything.