There is way more exploration in AvP2 than probably both AvP and 2010 combined.
Don't get me wrong, the maps are linear, but there is quite a bit of stuff that is very easy to miss in AvP2 if you go the most basic route. Especially if you are beating the campaign in three hours. Nobody gives AvP2 props for its story being brilliant, just that it had one. For some reason, I always felt AvP2 felt more like Jurassic Park than it did Alien or Predator, but I thought it worked fairly well. Still consider it the best game out of all the AvPs, even if it was tonally off.
AvP only got the balancing right imo. Maybe because I didn't have a computer capable of playing it at the time and played it after more story based shooters like AvP2 and Half Life had come out, it just felt very simple in comparison.
It's got a little bit more replayability with things like skirmish mode and the respawning aliens and they at least attempted a species balance (humans-technology, preds-toughness, aliens-speed) It's just not interesting from a narrative standpoint.
2010 was both a step back and step forward. I didn't like that you had to do things like push buttons to transition from one surface to another to wall walk as the Alien, or to press buttons to enter vents, but I did think that the colony levels and the surrounding areas were good Alien verse callbacks. Felt it lost steam with the AvP movie inspired temple bits but was still solid. Hell since its the only one I can still play, maybe I'll replay it tomorrow.