German planes up to around 5.0 are very competitive, if not superior to their peers (some exceptions like P 47's fighting F series 109's, early P 51's being super good at low altitiudes, and FW 190's being meh).
Italians, I can't speak for them, but they tend to be pretty meh, with some good planes mixed in.
US planes can be hit and miss, but once you reach super-props, you can stomp everything, and outturn any jet which outruns you.
Facing Pumas on the B1 is a nightmare. The 47mm gun is completely fucking useless.
I also hate that in naval you have to use shitty PT boats until you get to destroyers, and when you get to destroyers they're elderly and ugly WW1/interwar museum pieces until you get something actually decent like the Fletcher class ships. Pre-WW2 tanks have their charms and are much more tolerable to play and grind trough, but having to grind those useless little ships until I get to what I actually want to play feels like a chore.