Leveling up the commando perk is very restrictive compared to the other classes because you have to kill a certain enemy that you don't see a lot of during a mission. With a group of 6, you can see maybe 50 Stalkers (a liberal estimate) during a 7-wave game. Assuming you kill all of them, it'll take you 12 full games to get from 2-3. Meanwhile, the Medic, Support, Firebug, and Berserker are all 3-4 because they level up off of normal kills or actions.
it should be changed to be a bit easier to level.
it should be changed to be a bit easier to level.