I was indifferent to Ultraviolet. I didn't come away pissed off that I had spent the time sitting in the theater watching it. When I left from watching X-Men I was sorry I hadn't stayed at my parents' watching King Kong on TV. And somewhat upset they completely botched the franchise making it unlikely a better (X-Men) movie can be made in the near future.
Many of the visual effects in Ultraviolet were meant to be stylistic, which a lot of people simply shrugged off as "primitive" or "fake." I thought it might be a big detractor, but I didn't mind it - it worked for me. I had the same apprehension before watching Sky Captain, but was pleasantly surprised at how well it worked and that I actually enjoyed the movie.
Ultraviolet wasn't a very memorable film and neither was Elektra, but with X-Men I find myself trying hard to forget it as soon as possible. Another fairly lackluster movie with similar themes and faults was Aeon Flux. All of these still better than the recent X3 in most ways.
Bruno