Voyager was really great through the end of season 4, there were a few duds in the earlier epis but not that many. In the later seasons though after Jeri Taylor left and the show just focused on 7 all the time, the quality took a serious dive. I had also heard that B&B were very focused on getting Enterprise out there and lost their interest in Voyager so that didn't help at all. It really showed by the time Endgame rolled around. What a sorry ending to a show that had so much potential.