I remember being scared ****less by the original Predator films, even though there was a certain fascination involved everytime they were on TV. Still, the infrared bits, beheading/skinning humans and extracting their craniums+spinal cords was always unsettling for me as a kid. So much so that I would sometimes fear a Predator would come out and get me when I would go out at night, haha.
And lo and behold, I've developped an appreciation for them some 10 years later. Having recently rewatched the original one, Predator 2 and the recent Predators(none of that Alien vs Predator crap for me, thank you), I can definitely say that I liked all of them...to varying degrees, of course. The original's the best in my book(probably because the Predator actually appears uncloacked only during the end), but it's so much more than that. It combines elements of different genres in such a seamless and organic way I can't help but appreciate it. And the suspense is used in an extraordinarily efficient way. Plus, it's probably the only film I know that shows Arnie scared ****less.
While I've seen some criticise Predator 2 for the fact it moved on from the jungle scenario, I actually appreciated the move to crime-ridden LA(a concrete jungle). Still, I didn't think it was as good as the original and at some points I thought it was harkening back to it a little too much for my tastes. Danny Glover is a complete badass in it, though. Predators, while definitely lacking in the unknown quantity quality of the original, was pretty good as well. It was definitely a different type of story than the other two, but I thought the changing of the location to a Predator game reserve was a more logical step than having an Aliens vs Predators bonanza on Earth. I liked the references to the original as well and I thought that Alice Braga was a rare combination of badass, honorable and hot.

Adrien Brody was solid as well, in a role that just doesn't seem his thing to be honest and the fact that I would've liked to have seen Gerard Butler be the one to uncontrollably bash and chop the head of the last Predator off was probably my biggest complaint about the movie. That, and the fact that Laurence Fishburne's character was a goddamn waste of time.