While I think the OP could have been a good deal more civil about it, this is an issue with PDS games if you:
- Play them on high-res monitors - 1440p and up; or
- Play them from an armchair/couch at 2-3 metres away (something I do).
Given EU4 was one of the five games that Steam chose to highlight when initially promoting their Big Picture approach, I thought this was a little ironic, as playing from a couch on anything below a 50 inch (or bigger) screen at 1080p is quite challenging.
That said, I just down-res to 720p and it's fine. It's fine to suggest mods, but the first one I tried crashed the game when I gave it a run. I might give another a crack at some stage, but it'd be handy if all those people suggesting mods actually provided some suggestions of which mods to use. Mods are a bit of a minefield. For every one that helps a tonne, there are five (or more) that break things or are more trouble than they're worth, and filtering through them is a bit of a chore.