They have almost no combat vet so they start losing power once squads get vet. Thats why they feel a lot worse at the 6-7+ minute mark when vet 2 mainlines start coming out.
Probably the wild amount of letters scared you away from one of previous posts, so here, let me quote the important bit just for you:
For 300mp unit, they have lower vet requirements for cost, than other units in similar price range.
Vet values should be (if i read the outdated guide and changelog right)
- 50% construction rate (they moved medkits to vet 0 and that was a great buff)
- -30% weapon cooldown, -23% received accuracy +33% repair rate
- Unlocks the 'Concussive Grenade' Ability, +25% construction rate
- 40% accuracy
- No longer takes extra damage when you repair.
The basics on vet for combat units are: -23% RA, 40% accuracy, 20% cooldown, vet 1 ability and some flavour vet like extended range on abilities, reduced muni cost or faster recharge. Check which boxes SP fulfill.
They have regular combat unit vet in comparison to mainline infantry squads.