One of the first games, if not the first game, I ever played on PC. My father's PC as a wee lad. I cannot believe I found it on Steam. This is why Steam is the best. This game used to scare the sh$t out of me and you know what? it still does. This game really hits home!

I got my face ♥♥♥♥♥♥ by a little vagina looking bastard

Please ignore time played. I have played all the way through this a dozen times just never on this platform; I played it briefly to test it. It took some manual fixes
Pros: genuinely does feel like you are playing as one of the three sides, and they do a reasonable job of making them even so that none of them can just easily wipe the floor with the other two. Really intense. Most of the time it effectively evokes the vibe of one of the movies. There are several things that will have you replaying levels: The randomization(where on one playthrough you might face three Marines with pulse rifles and on another, in the exact same area, one marine with a smartgun), the bonus levels(the higher the difficulty setting you complete this on, the more of them you'll unlock. All of them let you play a level as a different species than what you normally do and when Predator and Marine play their way through an Alien level, the Predator gets a grappling hook and the Marine gets a jet pack), and the cheats(in order to get one you have to complete a regular level with very specific stats. They kind of feel like they came about by the developers just messing around with code for fun and certainly some of them are more interesting than necessarily useful, though the Alien sniper munch, which allows you to head bite at a very high distance, does fall into the latter category. Do note that you cannot get "credit" for completing a level that you completed with a cheat). Pretty good weapons and gadgets, I quite appreciate giving the Predator an energy gun that's incredibly powerful and does splash damage, and letting it immediately extinguish itself when it's on fire. The skirmish/co-op is incredibly entertaining, basically there will be a nonstop stream of Aliens spilling into the level and players can choose either Marine or Predator and fend them off. The AI is good sometimes great, and I greatly appreciate the implementation of panic, where a civilian will accidentally set themselves on fire with a Molotov or a Marine will fire their gun in a way that isn't 100% tactical, including times where they obviously wouldn't be able to hit you(it can make it more challenging for you since they're less predictable and maybe that civilian that just offed themselves was someone you needed to head bite for health, in addition to it capturing that element of the films). Wall-running as the Alien is quite enjoyable. You will never forget the image and sound of being facehugged. The FMV cutscenes have the goofy charm that those always did, and for those who really can't stand that sort of thing I'm not sure there's any part of this game where you're ever forced to directly look at it or necessarily even listen to it the text tends to be on the screen. Light and darkness is used really well to make hiding enemies more dangerous(and it is truly inspired of a decision to only ever let you deploy four flares at once, and make the Image Intensifier, essentially a sort of night vision, not work with the motion tracker so you always have to choose between one of the two, and obviously it doesn't work well in lit areas).
Cons: Some of what they do to even out the three sides is annoying, like the slow movement of the Predator, how much time the Marine spends just finding the weapons, etc. This is more interested in being intense than ever building atmosphere, which does feel at odds with how closely it aligns itself with the movies. The references to the movies get to be excessive, and there are several times where their eagerness to recreate a visual from one of the movies completely outweighs their ability to make it make sense. There is essentially no plot here, you're just moving through locations reminiscent of the movies. Some of the bonus levels and cheats can be quite hit and miss, annoying considering how difficult some of them are to get(to be fair this one can be circumvented by looking up all of them in a walkthrough). Ultimately, the Marine weapons do tend to boil down to ones that fire bullets and it's just varied by speed, accuracy and caliber. Some of the Predator's coolest weapons from the second film are not present. There are times where the wall-running has whoever is doing it, whether player or AI, getting stuck a lot, and in general there definitely are times where the AI will glitch out.
Most of the cons were improved on in the sequels.
It strongly recommended to fans of the films who are okay with it showing its age, mildly recommended to people who just want an intense FPS
I bought this on sale just so I could leave this review and help others decide if they want to buy and play this or not