I gave it a rent. Here are my thoughts:
Marine Campaign = Crap
Predator Campaign = Crap
Alien Campaign = Crap
Multiplayer = Okay.
I will admit, the biggest reason for playing AvP has always been the multiplayer (Especially AvP 2 and its evolution mode, my all time favourite) but I still was hoping for decent campaigns. AvP 1 had good campaigns, and AvP 2 had EXCELLENT campaigns. The ones in the new game are terribly designed and just boring. But the multiplayer is okay to fallback on.
I will admit, I don't think the MP is as good as past entries (In fact I've been enjoying the re-release of #1 on Steam A LOT, I'm amazed its held up as well, even if its still got lag issues and they reduced the player amount.) since its more limited and has less game modes, Evolution was a monolith game mode so I didn't expect it to be in a Rebellion game, but I would've at least expected Last Man Standing or Alien/Predator tag. Regardless, Species deathmatch is still a joy (And so is regular deathmatch) and the survival mode is still fun too.
Oddly enough, I don't get why everyone says the Alien controls are so awful, I'll admit the Predator controls are bad (More on that in a bit) because the controls feel tighter to me than they did in the old games. Mostly because you don't move as fast (And likewise, I don't get why they say the Alien is too fast. I imagine the people who say Alien is too fast in the new game would probably throw up of motion sickness if they played the old games as a Xenomorph) and you don't have to hold the crawl button the whole damn time, which allows you to focus more on whats below you and crawling slowly. The only MAJOUR quirks I have with Xenomorph controls is the fact it automatically crawls down walls when attempting to get on a set of stairs or a slope, and leaping from walls is a majour bitch to pull off.
I will say that I preferred having the ability to headbite in real time (Though since you rarely stand up, it'd be hard to line that up) as well as charging my tail to impale (Hey, that rhymed!) but stealth kills are still fun and when they say this game is grisly, they bloody mean it. Even I was shocked the first time I used my Xenomorph tail to cut someones neck and then slowly pulling it away, revealing sinew and bleeding tubes. In fact, I was pretty offended several times, not because of the grisly animations, but that I got in trouble for yelling "Holy HELL!" on the mic when players had their little kids watching them play. Wait, WHAT!?!? You'll let your 4 year old watch a Predator pull someones spine out, but a very minor curse like "Hell" is going to traumatize them for life? And I'm serious, I've run into 35 players that had little kids watching them play but whined if anyone said so much as "Crap." Parenting!
Anyway, back on topic. The xenomorph has and always will be my favourite species to play as, and maybe its just my practice with the old school editions, its the only species I'm good at. In fact I loved the sheer ANGERRRR of one man who I was persecuting (Dominating, essentially) who found a flamethrower, and was all gung-ho because he actually watched the damn movie(s) and remembers that the flamethrower is the best weapon against Xenomorphs and was burning my team mate, and I saw him and ran off and then clung to a ceiling, and he never bothered to look up and I dropped down after he passed and impaled him.
The predator is disappointing. The controls in the old games were perfect for Predator, you could zoom in and swap weapons on the fly while moving fast. The predator now moves really slow and doesn't have a run function like the other two species, and using weapons is a majour pain as you always have your claws out and must press a specially assigned button to use your weapon. Aiming is also harder as he turns the slowest and only two weapons use the triangulation reticle, and finally zooming in is slow as well. You also can't run and jump, you have to press a special button and then aim for a spot to jump somewhere. That sucks.
Marine handles fine, but its harder to mess up running and gunning controls. I will say, its incredible that the marine is actually fairly sturdy this time around, in MP it actually feels more balanced, even if some people seem to think the marine weaponry is "Overpowered," but I don't feel its overpowered.
So yeah, those are my thoughts. MP is okay. I'm not going to buy it until its a bit cheaper, and even then I'll only buy it on the presumption people are still playing it online. Otherwise its fairly "Meh."