Well I've only played 3 hours but they were very good hours, so I'd say it's worth a punt. It's considerably easier to grasp than CK2 or EU4 as well. I've spent hundreds of hours in both of those and it looks like I will be with this too. Oh, and they're releasing Hearts of Iron IV in a month - RIP time!
One thing which deserves special mention is the soundtrack. EU4 had a superb soundtrack and this is of equal quality (but totally different). Really wishing I'd bought the version where it comes bundled.