There was a Game Informer preview about EU4 before it came out. I remember it comparing EU4 to 3 and mentioning how much easier to get into it was. They said that earlier games from Paradox were like trying to read a complex physics textbook for fun. That sounded like something I would do, so I grabbed EU3 and all its expansions, and got EU4 when it came out a year later, I think? May have been a shorter amount of time.
I thought EU:Rome was fine. A bit shallow and boring after a while, but fine. The Blobeucids were terrifying.