Species
 

There are 3 main species to consider when playing Aliens versus Predator.

Each has it's pro's and con's.
A good player will have the ability, not necessarily to master but, to learn ALL of them

Marines These guys fear nothing and pack some mean artillery GUNG HO!!!!!!  Boys

Predator Keep a Sharp eye on these If you can see them that is

Alien Probably the most feared Given their reputation