Why are you going to abandon a character just because of something that actually isn't a bug. I believe beth intended for the beast race vamps to keep their old vanilla vamp eyes. It's no bug. And im actually glad they did it that way. The eyes to the beast races are different anyways from the human and elf races, so i can see why their vampire eyes won't look the same (after all there vamp eyes didn't look the same as the human and elf vamp eyes in vanilla so why should it look the same in dawnguard?).
Besides, it's nice to have a vampire that still looks vanilla like, in the skyrim world of dawnguard style vampires.
I have a Khajiit vampire who still looks physically the same as she did in vanilla skyrim, but i don't care, im not going to abandon her just because she doesn't have the same glowing eyes that other vamps do. What's cool about it though is that it makes her unique, after all, even in vanilla skyrim vamp eyes were different from each other depending on race, so at least some of that has passed over into dawnguard.
If the beast races eyes were supposed to be different, why not give them unique eyes for the dawnguard expansion? I think the "they're supposed to be different because beasts are beasts" argument is crap because if that was the case bethesda would have redone them with new eyes seperate from the human and elf ones instead of just leaving them the way they were before. This was just laziness or an oversight they refused to fix. Plain and simple.