Scar face- aliens do attack from the shadows & get their prey by surprise in most instances. In the original Alien for example, did giger's drone ever blunder down a hallway, charging at it's prey like a mindless animal? no it did not. Aliens are cunning creatures that usually like to wait until their prey is vulnerable to attack, then ambush them before they can see it coming.
In AVP the queen didn't have the same menace that made her so great in Aliens. Granted, she looked better in AVP, but she just ran around like a t-rex screeching at everything & tearing apart anything in her way, now don't get me wrong, the AVP queen was kick@$$, but she just didn't have the menace of the Aliens queen. The queen from Aliens was a cunning, menacing beast. For reference, just look at how she figured out how to use the elevator to get to her prey, or how she managed to keep her enormous body concealed until the last moment when she impaled Bishop with her tail. She was a deadly, efficient killing machine.
Honestly, if ever a director was dumb enough to put a ravager in an alien movie, they would be many times more hated by alien fans that Paul Anderson. A ravager in a movie would screw the alien franchise over worse than that d@mn newborn, why can't some people leave a good franchise as it is without adding all that sort of childish rubbish?