2.- cost (and your economic capacity to cover these)
4.- how can it be countered
I do not say that they are more important than the stats, but all that matters
1.- population: try to mix your troops with native alliance, if in enlightenment age, prepare to up to national age you chose, Princesa de Asturias\n♦ Spanish ♦ , mix with Rottweiler dogs....
2.- cost (and your economic capacity to cover these): mix with some HC Card about economic upgrade, or reach economic upgrade tech in some econimic building, like market, mill, plantation, ... to make your villager gather all resources faster. I also detected that Habsburgs has 2 HC cards for factory, use these 2 of this, and choose 1 of 3 resources in this building to make it trickle resources (there's a tactic that can auto train mighty Li'l bombard too)
3.- versatility: you can make a powerful Habsburgs in your game if you have better skilled
4.- how can it be countered: the only answer is skilled and swift strategy