This movie kept very well to the feel of all of the movies that have led up to it. It kept the sense of oncoming, unstoppable force of nature beings - but actually was able to come off a bit funny as well. That is something that, until now, had been lacking in the series, and is somewhat refreshing.
I personally did not like the use of the old musical riff from the older predator movies for the high intensity scenes - it seemed unoriginal, though that's debatable I suppose.
The movie did a really good job of using stereotypes of warriors and preexisting knowledge that the audience might have, ie: the inclusion of a Spetznatz and a Yakuza, while allowing those who have little such knowledge to still watch the movie without being confused.
The most enjoyable part of the movie for me personally was feel that the two parties were actually hunting one another, which one would think would take away from the "predators" seeming prowess. Instead, it only makes them look that much more unstoppable.
I would highly recommend this movie to anyone that has enjoyed the series!