Yeah, AvP2 is a good suggestion also. In all honesty it offers way more diversity than the first one - never played it myself, but class and game modes selection in multiplayer menu tells enough. But on the other hand, there's just something... enjoyably simple in AvP1's multy. It feels kinda late-90's, UT oldschools fun.
Assuming my memories aren't in any way faulty*, and I think I keep switching between past and present tense:
I've played both in MP, and AvP 2's campaign (never did AvP Gold's campaign), but it's probably been 6-10 years since I've played either in MP? The multiplayer in AvP 2 felt nowhere near as fun to me as AvP Gold's. Personally, I think they achieved perfection in the design and play of the Alien in AvP Gold. They nerfed Predators hard too in AvP 2 - they gave them vision modes that are close-range only and literally leave you running around in thick fog, among other things. It's probably debatable whether it's better to scatter their weapons around the map as in AvP 2, or let them start with everything as in AvP Gold. AvP Gold's way makes them more like a boss, and AvP Gold's way feels more right to me as long as the player count for each species is asymmetric in favor of humans, and includes either all three species (if there are more than 5 players) or only aliens and humans, and the humans are working together.
I assume they nerfed Predators in AvP 2 because in a one-on-one game, Predators in AvP Gold would almost always win, because they could sit in one vision mode which made the species that vision mode was optimized for absurdly easy to see at a tradeoff of being largely unable to see anyone else, and gave them auto-aim at that species only, with instakill or extremely damaging (but not necessarily rapid-firing) weapons. They also have very tough armor versus stock human weapons, and have a gadget that heals them. They really are more like bosses.
So in AvP Gold, if you're playing a predator against 4+ humans and 1 or 2 aliens: You look for humans, and an alien might get you. Look for aliens, and the humans might. Flip vision modes constantly like a paranoid maniac and you might not die horribly and might be able to react fast enough to kill whoever you see before they get you. Aliens are fast as hell, though, and can instakill with their tails if they charge them up or heads if they get to point-blank range and click right on yours, and humans have a tendency to realize they're fragile and conduct hit-and-run attacks or ambushes, and call it a win if they only lose one guy taking you down, or even better, if they take you completely by surprise and lose nobody.
With aliens against humans - the way I liked to play aliens anyways - it's more like "OH FUCK THE GUY COVERING THE REAR JUST DIED! WHERE'S THE ALIEN!? THROW FLARES! *EMPTIES CLIPS FIRING INTO THE DARK* WHERE DID IT GO!??! WHY DIDN'T THE MOTION SENSOR GO OFF!? SWEET MOTHER OF GOD, WE'RE ALL GOING TO DIE! FALL BACK! FALL BACK!"
* Human memories are pretty fallible, so I expect at least one thing in here to be inaccurate or flat-out wrong.