Maybe you shouldn't ally two countries that want to fight each other.
Story time!
So, there are two dumb HRE countries: Bavaria and Brandenburg. Bavaria calls Hungary, which assumes control. Brandenburg calls for Austria and it calls me, Spain, though I don't assume control. Then, something funny happens and (I knew they were allied, but well...I was stupid) Hungary calls France, who assumes control.
So, I am completely alone against the Blue Blob with Royal Navy having a party across the French shore, Swedish and Naepolitian armies just chilling out and Portuguese busy fighting Kanem Bornu. France has 130 stacks and I have 60 (+20 in Indonesia)), with only 15k manpower. I can't call my allies thanks to the stupid alliance mechanics even while getting the innocent Iberian peninsula raped by dirty, sweaty, hairy Frenchmen with moustaches...So, two 30-doomstacks appear. I have 20-stacks on the mountain provinces to the North so I have a nice chance, right?
Turns out I have two generals with 2 and 3 pips on shock thanks to the stupid army tradition mechanics and France has a general with 5 pips on fire and 6 on shock...an another with 3 on fire and 6 on shock. Even though I have the mountain and the same technology and the same 120% discipline, it just runs through my stacks and DESTROYS THEM JUST LIKE I DID TO THE POOR AZTECS. I lose 2 of the stacks and retreat the 3rd to Granada, where it gets destroyed as well.
Maybe I can give Roussilon and Bearn and maybe some money and save my ass off, right? Then, fucking England calls me against fucking NAPLES, which is allied to me and Portugal, which is allied to me as well.
I don't click anything, just take another bite off my sandwich, press ESC and "Exit game". I don't know if I want to return or not.