I did find it kind of disturbing that Daniel would wish to become a vampire after hearing Louis's tale. Louis tells Daniel of all the suffering he has endured as a result of becoming a vampire. Even after hearing all of the heartbreak of watching Claudia struggle with her age and finally die, while being able to do nothing about it, it is crazy that Daniel would want a life such as that. I do not see the glory in being a vampire as Daniel obviously does. I think Louis ought to have roughed him up a bit to give him a healthy dose of fear.
I really felt for Louis all throughout the book. Even in his human life, he was deeply sad and this did not change as he hoped it would upon becoming a vampire. The sadness was only eternally prolonged, not nullified. To bear such a heavy burden as Louis does for all of time sounds like the worst nightmare I could imagine. Far worse than being a vampire. I would even go so far as to say that I would rather be Louis or Lestat's prey than have to live forever.
This whole living forever thing that is associated with vampires seems to be something that humans really covet. I really don't understand why, though. Immortality is not human, natural, or normal. Humans have deep ties to each other and I can't see why someone would want to live beyond everyone they know and love.