The Imperial Guard infantry are dog shit.
But their vehicles seem to be where they shine? Their Leman Russ tank seems to be especially tanky for what they spend, and this tank isnt meant to be getting into slugging matches with the enemy. Its meant to skirmish around the flanks and zip around blasting stuff. Its a useful chassis we can press into all sorts of roles, like anti air, tank hunter, MBT, SPG, artillery, engineering vehicle, a transport, an EW tank... the possibilities are endless.
So what we are building is something with armor at LEAST as good as a Leman Russ, but unlike a Leman Russ, isnt meant to be driven into the teeth of the enemy, though we can certainly do that if we need to.