1. Alouette III 20mm. Dies in literally three seconds to anything.
Glad we don't have that unit ingame then ...
SU-122-54: This is the absolute worst tank destroyer ever. Why is it even BIG sized? 2 AP HEAT?
That's why it is not fielded in a tank destroyer role, but an infantry support one instead. With HE 4, it has the same anti-infantry power than a Abbot howitzer or a 120mm mortar round. Besides, its 14,5mm HMG provides some AA cover to the nearby infantry.
US Riflemen (everything is a better choice)
May be they ain't the best NATO infantry, but they're the only one that may come with the strongest NATO IFV: the Bradley.
ASU-85 support vehicle: 250km autonomy...
Like the SU-122-54 above, it is an infantry support gun. And being an airdropable one, it lacks autonomy like all its brethen (Sheridan, M8 AGS, Wiesel, ...). It is made to support foot infantry, and is quite useful to add some HE firepower to cheap or recon infantry chasing special forces behind your back.
As for the others mentionned here, some may indeed be weaker than others, but I also think it depends on the way you play or the situation. For example, the OP mentionned Gazelle Canon (and not Alouette III
) is in my opinion a very useful and versatile helo, but is indeed very fragile and "dies to everything" when wrongly handled ... Nevertheless, I always have some in my sleeves ...