I agree with you about SGU - I finally saw it this year (or possibly last year?). I think it might have had some potential if it has not been trying to be part of the Stargate franchise. Although overall I found the characters and plots boring.

I've seen some of Sanctuary, and it seemed an interesting premise, but I didn't get very far into it. Like Warehouse 13 - I should try and watch more of both, iirc I have the first season of each on dvd.