Aliens get it why not marines..
One of the fun things about playing the alien side is the ability to play different aliens and classes.
So why cant the marines have the same fun?
I feel that just buying a shotgun or a grenade launcher doesnt really make marines as versatile and fun as the aliens. You see a hundred things about alien tweaking but how much can you really do with the marines?
It would be nice if say that as well as a armory you could have some kind of small building that marines can step into to have their class or even armor upgraded.
And depending on the class will give you access to upgraded weapons researched by commander.
I also beleive that maybe a machine gun class is needed later in the level when you have 5 onos stomping down the door.
You could even go as far to add certain upgrades to classes, like a scout class with lower armor but faster speed. Or a engineer class that starts out with a welder.
This would make the marine class so much enjoyable because right now one of the biggest flaws of natural selection 1 and more so now, is marines are dependent mainly on a team with superior first person playing skill. If your team isnt so good at fps....things will go bad.
But something is needed to make the marines gameplay stand out from natural selection 1. And adding classes would only help to balance the gameplay.
Though thats alot of extra work to implement...