The problem for me was partially the characters / development, but partially the cast.
In DS9 difficult to take to characters really grew on me through the strength of the writing and some great performances - i.e. Sisko, Kira and Odo. Even supporting characters like Garak and Rom came into their own.
In Voyager, Janeway, Tuvok, Torres and Neelix ended the series just as unlikeable as when it started, and the majority of the rest of the cast were just making up the numbers.
Paris and Seven were OK, Chakotay could have been interesting but really wasn't, Kes was insipid and Harry was bland. The only character I really liked was the Doctor...