In my mind, Jodorowsky is one of those things or people that we're told to like but it's hard to understand why and we know it's not because it's too complicated and we need time to figure it out. I went through a Jodorowsky collecting phase after reading The Incal and bought Technopriests, Metabarons, Screaming Planet, and Son of the Gun. I think I liked Screaming Planet the best and Techopriests the least. Metabarons was OK and Son of the Gun was a bit better but Technopriests was very disappointing.
Technopriests is all over the place with a barely coherent story. It's mostly just space opera scene after space opera scene without much plot connecting the scenes. A whole lot of pseudo computer stuff mixed with Jodorowsky's surreal sci-fi vision. Sometimes his vision works ok but here it's just a mess. Also, I was probably let down after reading so much Jodorowsky and not really understanding why he's so hyped. The Incal was good enough but not nearly as well made as many, many other FrancoBelgian comics I've read. Maybe it was groundbreaking when it first came out but now it's just sort of "passable." Jodorowsky and his "vision" (including El Topo) seems to me to be a typical European decadent/excessive/provocative art that doesn't actually measure up to its ambitions in the way that a lot of European art does, particularly comicbook art (Manara, Pratt, Yslaire, Moebius in other works, Bilal, etc.). Maybe he gets too much latitude because of El Topo and how important it was in the whole start of the indie/Midnight Movie thing. But is El Topo even all that great or was it just a novelty at the time?
So, bottom line, keep your expectations low when buying Jodorowsky or you'll end up feeling swindled by all the hype around his name. Some of it is not bad but overall if you want coherent or intelligent sci-fi you should look elsewhere. The art in Technopriests and other Jodorowsky-authored works is pretty good but Jodorowsky wrote this stuff. He didn't draw it. And what you get here is pretty much standard FrancoBelgian sci-fi/fantasy drawings which are usually high quality but somewhat sterile. Again, see Manara or Yslaire for more interesting art. Incidentally, Jodorowsky worked with Manara on a comic on the Borgia family and it is pretty good. But then, it seems more Manara (very, very well drawn but really pervy) than Jodorowsky (sometimes loses control of its imagination at the expense of the plot).