I think Huda said it all but I will say that the first film at least had a chance to be good if it was executed correctly, which it obviously wasn;t.
I disagree that film was too long, if anything it could have done with an another twenty odd minutes to help with character development. Only thing needed then is a good script and not taking artistic licences with real world facts because it makes the film look stupid.
The thing that annoyed me too was the lore breaking life-cycle, it was way too fast. I think one character was impregnated and burst within less than 10 minutes.
I agree with you to an extent Hicks, about the Predator behavior, but I disagree about Celtic, while they are indeed arrogant and over-confident creatures, they were never supposed to be suicidely so.
It does makes sense when it comes to hunting humans because they are inferior and so the Pred's demise comes from underestimating the humans but Xenomorphs are their physical equal or superior, so being cocky on a Xeno hunt is supremely stupid to say the least, a good hunter learns all they can about their quarry, evidently these predators didn't.