Ok, the final level was a terribly lame way to end the game. Should've just ended after the boss fight of the previous level. The car race was the lamest level and then I was expecting to get out of the car and have an awesome final boss fight for the skull and...the credits rolled, lol.
Otherwise, game rocked. I liked how it ripped off every shooter so it felt like a complete package but constantly fun. The shooting was great, the turret parts were great, the first car sequence was a fun diversion, the chopper turret was great. It really had everything plus a crystal skull. I think it could've used some variety for the boss fights instead of just having a tougher chopper fight everytime, but then otoh I liked the chopper fights because they were easy, so I didn't really care

I think what really made the game was how different all the weapons are. When I was like halfway through the game and the enemies started to not die so quickly with my weapons, I saved up and got the best assault rifle and then everyone was going down in a second or two and it was awesome. Then I kept running out of ammo and my blue shotgun weapon sucked so I saved up and bought the best uzi and suddenly I was running around without even using the L-trigger aim and just blowing away guys in 1 second with the super uzi. Loved the explosive round pistol too and liked that there was enough ammo around to use rockets whenever. Add in grenades and I always had a lot of stuff to blow people away, which was rad.
The game is fun enough that it almost makes me want to go and try to 1000/1000 it someday. Best.$20.game.ever.