In oblivion I actually thought that being a vampire was like a real thing like I actually went after it but in skyrim it's more of oh I'm done with all the main questing let me just be a vampire to be a vampire. They have really weak spells/abilities I mean most the stuff didn't even help me.
I completely agree, I mean, the drain life spell maxed out, where it drains 5 points of health per second is pretty good, but most of the abilities are one use per day things and that makes it mostly ineffective in a real battle. In oblivion, I spent basically my first thirty levels as a vampire before deciding that I needed to change back so I could continue with the story line without everyone trying to kill me XD, I only recently went and made a vampire character for Skyrim and honestly, I do enjoy it, I just wish there was more to it, and there soon will be lol