The 222 just needs to be like the Panzer Elite one in Coh1. Just increase the price to 50 fuel and let it actually snipe one or two infantry models per salvo.
Currently it's just a throw away unit.
That has allot to do with the fact that 222's auto cannon uses AOE and not accuracy to do damage to infatry.
Actually the current implementation is an unnecessary mess.
Luch Centaur and 222 all use a similar caliber gun 20mm.
222 uses AOE vs infantry since the chances of scoring a hit are low, also has the standard cover modifiers. (0.5/1 yellow, 0.5/0.5 green), (garrison 0.4/0.25) (accuracy 0.05/0.04/0.03)
Luch uses accuracy vs infantry has more than 10 times more accuracy (0.65/0.5/0.4) the 222 but also has other unique feature like: lower cover modifiers (0.5/1 yellow, 0.5/0.25, green, (garrison 0.5/0.3), ignore cover via point blank, accuracy penalty vs vehicles 0.0625.
Centaur uses accuracy vs infantry has even more accuracy than the luch (0.675/0.618/0.56) but has some of the best modifiers vs cover (1/1 it ignores yellow cover, 0.50/1, green, (garrison 0.5/0.35)
These differences offer very little from balance stand point of view and while making it difficult for the user know what to expect from the units.
They could easily be fixed, for instance the the 222 auto-canon could easily start using accuracy vs infantry since its current vet bonuses accuracy on the main gun do not actually offer an real advantage.