When I saw the SG movie, I really enjoyed the story and the concept, but I thought KR was so stiff and unemotional, I just couldn't buy into the character at all. IMHO RDA's Jack is a much better, more rounded character. Then again, he's had 4 years to work on it, so....!!
I also really liked JS's version of Daniel, but I've always had a problem with JS, after seeing him in various Bratpack films and Mannequin, where he plays complete greasy gits!!
I feel that the series has taken a fascinating concept and taken it to the edge, again and again. Obviously, not every episode is groundbreaking or anything, but the long running arcs are what keep me interested.