Even by the standards set up in the premise and beginning, by the end of Season 4 I was done. Just a little too out there, the producers must have been thinking that because they got away with the first 3 seasons of this nonsense the audience wouldn't mind another.
Pure escapism, and never to anyplace pleasant.
But the cliffhanger, well, that just might see me downloading Season 5, although I should watch a few other things to cleanse my intellectual palate...