222 cannot harm infantry, and is no threat and has weak armor.
You're thinking of it wrong.
You're putting it in the Stuart leauge. For god's sake it's 15 fuel (same as the soviet M3A1). It's supposed to counter stuff like bren carriers and soviet scout cars.
Also about its damage. It's damage is fine, maybe you should stop when firing so the accuracy will not decrease from movement penalty.
It's a fast hunter-killer that packs a mean punch for its price but relies on speed for protection. It is NOT an anti-infantry substitute to a light tank. IT IS A SCOUT CAR.
SCOUT CAR NOT A LIGHT TANK
If this thing is buffed it would just wipe infantry, and with its speed, run away. Think about that.
Also it's AA.