I don't know... It was something I used to love in movies, a good old monster fight. But now, I kind of switch off. It either boils down to a cg cutscene or a bunch of practical effects bumping arms and fists. I lost interest when Hulk fought Abomination for example. It is always much more interesting for me when there is a human element involved. Well written, multi layered characters facing an unstoppable foe driven a the simple purpose: To hunt.
As for the humans siding with a Predator in AVP - For me that's the same as a game hunter joining forces with an antelope to hunt a lion. I don't ever think humans should even have the opportunity to communicate with a Pred. For example: When Lex is with Scar, she is essentially having a conversation with herself while Scar mimes. It felt kind of awkward. Whereas the Yautja from the original Predator I feel would just walk away from her and not look back. And if Lex persisted he would probably just break her neck. This is a culture which beings from a young age are taught to hunt for honour. They shouldn't feel any loyalty or responsibility towards humans, aside from sparing the weak and defenceless - But I always thought this was solely because it is bad sport rather than compassion.
If it's multiple Predators as a team then that is fine. I would be interested to see how the co-ordinate their attacks and if they have team rules (Like they only attack an equal or larger numbered amount of foes) and see the dynamic. Or maybe the alpha Yautja chooses the strongest foe and the other Predators are not allowed to touch said human. That could be really interesting. But I don't like 'The Predator who sees the importance in humanity and has the heart of gold' route.