I think the Alien has an advantage. Multiplayer needs balance.

You just have not met anyone who is good with a predator yet, or even a good marine. As I have posted elsewhere, the predator has by far the most advantages, as I have listed below:

-Can run as fast as an alien (though using certain techniques an alien can go much faster)
-Can use camouflage against marines and other preds
-All weapons are capable of being a one hit kill in some respect, (yes, even the wrist blades)
-Most health of all races, around three times as much as a marine
-Three different vision modes which highlight individual species, although can be difficult to utilise against multiple species, in 1v1, this makes the predator the king in any versus situation.
-Speargun has an instantaneous velocity, meaning you just need to time the shot right.
-Lock on weapons like the Shoulder Cannon and (ugh) Disc
-Can heal any time it wishes providing it has the energy to do so (as opposed to the alien which has to kill first, or marine which has to find pick-ups)
-Most maps are well suited to the Predator (and to a lesser extent, the marine), with few maps being that good for aliens.

Lol, ain't that the truth. But not because of that. XD