Voyager is a decent series but it has to have some of the most preposterous individual plots and sci-fi mumbo jumbo of any of the Star Trek series (For the most extreme example, recall the episode where using an experimental faster-than-warp engine technology makes Tom Paris "evolve" into a newt.).
But otherwise its good solid fun and in between the preposterously stupid episodes there are some really good ones.
And yes, Seven of Nine is a total babe.