It is a true cliffhanger along the lines of a Camelot, Incursion II, and The Siege II. The kind that, once it ends, will leave you asking yourselves: “How the hell are they going to get out of this one! Can’t wait until the next episode!” Except there won’t be a next episode, much less a next season. Also, in response to a question several have posed: Unfortunately, the last few episodes build upon each other so simply switching the airing order wouldn’t have helped. You could consider Epilogue the series finale and move on to some other show (I hear great things about Breaking Bad) but that would rob you of two truly awesome episodes in Blockade and Gauntlet. Both deliver action, adventure, humor, and some terrific character moments. Gauntlet, in particular, is very touching and its conclusion will no doubt you leave you…among many other things…frustrated, incredulous, outraged, offended, annoyed, vexed, saddened, distressed, bitter, aghast, irritated, unsatisfied, pissed-off, melancholy, miserable, confused, furious, dejected, riled, shocked, heartsick, angry, surprised, exasperated, indignant, enraged, despondent, bewildered, dismayed, incensed, stunned, and grief-stricken.
Fair warning.
Also, here's a very true post on Gateworld,