The first and second seasons started off shakily, with good episodes sandwiched in between average ones, and at times resorting to clichéd stories. But once it started to set up the universe in which it exists and started to develop it's characters more, it became a lot more fun and entertaining.
The main reason this show succeeds it because of four men: Richard Dean Anderson, Peter Deluise, Joseph Malozzie and Paul Mullie. Richard's dry sense of humour makes to show so much better, Peter's directing is excellent and makes any episode so much more entertaining, and Joe & Paul never fail to make a funny, interesting episode together.
Once you understand what the show is about and get to know the characters, I doubt you won't like the show. For those getting into the show I suggest the episodes 'The Other Side', a good serious episode, and 'Window of Opportunity', a classic comic relief episode.