I think that these movies would have been a lot better if they didn't try to bring in so much new stuff to the creatures, they should have stick ed with what they got.
One part of the "coolness" to the Predator is that he was a hunter, living only for the hunt, for the next trophy, he once was a easy creature, primitive in it's nature but was using high tech gear and weapons, which he sometimes used sadistically, he liked to toy with his targets, enjoying their fear.
The Alien was a nightmarish creature without mercy.
You might think that it saved your ass because you were pregnant or unarmed;)...
...until you see that egg opening up in front of you...
I wouldn't mind new weapons for the Predators or a new hybrid for the aliens, and sure we got some new weapons and a new hybrid.
But everything else was just wrong.
I still get chills from the first chestbust in "Alien" and from the line;
- Kill...me... ,In "Aliens".
And I still get a "stalker" vibe from the Predator, as he was watching his targets from the distance, choosing his prey and picking them off one by one.
I can watch P1 over and over and never get tired of it, and the coolest scene in P2 must be when the Keyes and his men are trying to ambush the Predator in the slaughter house...
I really miss that vibe from both the Alien and Predator movies in AVP and AVP-R.