I do like Voyager quite a bit, but here's what I noticed. I'll try to stick to broad strokes rather than nitpicking everything.
The major problem the show had was a lack of continuity/consequences over time, and even this wasn't consistent. Seasons two and seven had some story arcs where one thing built on another, but almost the entirety of seasons five and six were stand alone episodes where continuity was almost deliberately ignored.
An example would be the crews encounters with the Malon. They first run into them in "Night" and then an episode or two later. They then make two 10,000 light years jumps in "Timeless" and "Dark Frontier"... and then encounter the Malon again. There's no way those guys would be 20,000 light years apart. I don't think the writers had a clue just how far away that would be. And there were other examples where the sheer distance Voyager had covered was ignored.
Then of course there were episodes where the ship was trashed in a fight, and yet would be spic and span the next week, with no word of explanation offered. There's a show in the seventh season where the ship is sitting on the surface of a planet, surrounded by mesas, and the crew have stripped it down for repairs due to wear and tear. Had they shown something like that more often, it would have made up for a lot.
In short, a lot of the time the show feels like it's "episode of the week" and the writers hoped we'd ignore things that contradicted what had come before. Voyager as a show really was made for ongoing story momentum, and it didn't have it more often than not.