I think the Commando could be improved but it shows similar replacement symptoms compared to every other unit.
(See Flamethrower to Salamander.)
The Commando gets a grenade launcher ability that does some damage against vehicles. Chipping away at vehicle armor to shoot the meat is what most infantry do when no tanks support.
Tanks on the other hand bypass armor damaging the meat directly. But mostly work better against vehicles over infantry.
I think most the issues stem from the fact the Commando ks locked behind the Spec Ops Center, and relevant for maybe 10 levels.
With the Gear / Bar drought to players in his tier, you pass him by.
Considering the Ranger is basically our Advanced Trooper, and they also suck putting out less damage than the Commando maybe the solution is to buff the units wholesale. The issue is no one has a single solid solution.
We can give the Ranger a melee attack suggestion, but where's his AT? Why does a unit that costs Iron / Steel (Valuable) Do so little?
Comparing the Commando to the Shock Troop is rather underhanded. The Shock Troop works as cannon fodder at the least.
I think I wouldn't be opposed to Rangers having AT grenades, or Commando's maybe not costing nanos.