Stargate Universe had a great premise but the characters were horrible.
What annoyed me most was the constant bickering. They spent the three-four first episodes just arguing and whining. Everytime I read some comments about possible Starfleet-Maquis tension on Voyager I actually bles Braga and his gang for not turning Voyager into the depressive mess Stargate Univerese became.
A relative of mine who's also an SF-fan admitted that he actually fell asleep on two occasions while watching the show. That made me start watching it again after not watching it for three episodes because it became a constant joke between me and my relative. "Oh, it's Saturday again and our favorites will see that we don't stay up too long!"
Rush was the only character I liked, mainly because of Carlyle who is a great actor. I must admit that he added another fun aspect for me because he looks like a dead ringer to a crazy person I worked with a couple of years ago and everytime he's some weird character in some movie or series, he reminds me of that person.
The only characters I liked in the series were those pale blue aliens who showed up in the middle of season 1. They added some action to the series which it had been nothing of up to that. Sadly, we didn't see so much of them in coming episodes.