I've watched a few Stargate episodes over the years, but I hadn't just fallen in love with any of them until SGU. I watched the first couple of episodes when they originally aired then as goes life I just didn't make it a priority and fell out of it. I'm now watching them on Netflix and am about 10 episodes from the end of season two, which I guess is all they made.
But from reading the comments about SGU it seems that most die hard SG fans don't care for the show. Why? I'm totally digging the storylines and character development, and given I loved TNG, DS9, and Voy, I see elements of all three in SGU.
Personally, I am a big fan too. I was disappointed when the show ended.