Marines have NEVER been what they should be. This has nothing to do with 2.0 darnit.
Aliens have 5 classes, each class has 3 evolution upgrades, each upgrade has 3 sub-choices. That means I've got 45 different combinations of alien to choose from. I can be a fade with redemption, cloaking and celerity; or i can be a fade with carapace, pheremones and adrenaline. Both those fades have different play styles and different strategic value.
Marines on the other hand which are supposed to be the team orientated side have 3 classed and 4 weapon types. Thats 12 total different combinations matched against the alien's 45. Without diversity teamwork is not as implied. You take TF and you have a incredibly team orientated game because of the great diversity of classes and their dependance on one another.
I've always seen more natural cooperation from alien players however than marines. Fades show up when a squad of marines need to be driven out of a position, skulks charge in suicide rushes just to delay the marines while gorges work to build their side up, gorges healing behind the front lines while aliens rotate in and out of combat. Marines have no comparison to this kind of natural teamwork except for the welder healer because they have no diversity they are not dependant on one another in any kind of team sense.
Now if marines had medics, sensor scouts, demomen and the like there would be a vast improvement in the natural cooperation of the team.
I can't believe posts like this are getting locked either. The public players make a far vaster testing pool than any private group of testers, it makes no sense to slince us.