They probably hear a lot like us, except a little muffled. Their ears are probably covered with skin, but are still fully functional, there's plenty of real creatures that have sealed ears.
The one instance we DO get to see a Xeno's POV in canon was in Alien 3, and I don't think that was meant to do anything other than let us know that it really likes climbing walls while chasing things.
but the thing is,they can see! they are not blind.
they see as if they are looking through a fish lense as seen in all the avp and aliens games.(even colonial marines)
Games are not an accurate reflection of the film canon. Of course they can see in the games; you can't exactly expect people to play as a character who can't see or hear.
The predators also have completely normal vision in the games, yet the movies show they don't.