I would say there was humour in the first movie, not flat out comedy. "The naked gun" is comedy, Predator is not. It's a serious movie with popcorn fun mixed in, hence the infamous one liners.
I love this, because it gives the movie a lightness and it's a big part why it has rewatch value, you can watch Predator on a thursday afternoon, and besides it being a very brutal movie, you don't feel bad at all. Predator 2 also has that, but at times unintentional, to be honest. Predators is the least favourite for me, partly because it feels dead on grim the whole time, there is (almost) no fun exchange between the characters, they all mistrust and don't give a f**k about each others until they... well, die.
I hope The Predator gives us that kind of humour and lightness, not flat out comedy to the point of self parody though, and it think that's all that people are asking for.