The shunning of most of Voyager's supporting cast once Seven joined
Thats one of the reasons I gave up on Voyager for a couple of years. It really made me hate the character and Seven still annoys me.
Endgame -- we never saw any scenes on Earth once Voyager arrived
I've always thought a series on Earth would have been a nice add on to Voyager. Ok, so the series logical conclusion was to finish once they were home. But how much better would it have been to have Seven try to integrate into a non-military society? What about the Maquis crew, whats next for them? Plus with all the changes, such as the war and Janeways ex moving on, how would they cope with a whole new society around them?
It would be a completely new format, but one that might have poduced a few interesting personal stories for them.