Let’s clear at least the picture whether you agree with it or not.
CK2 has always been the most polished, bug free and fun of all the Paradox games. It’s only since last December that opinions changed. The game is now rather buggy and lots of features are being added that either do not work properly or aren’t well balanced. It became more of a patchwork game than an elegant one, and it lost a lot of the polish it had. Right now, CK2 is considered not being in a good status, otherwise it was.
EU4. Lots of people who played EU3 think that neither is a clear winner. Usually people like one feature better in one or the other, so it’s mixed. Which one is better comes down more to personal preference. EU3 was also received rather poorly at release, and only with time it improved. Right now it’s post-DLC buggyness. It’s STILL more playable that CK2 currently is and the last DLC was well received.
In any case, both CK2 and EU4 are considered the easiest games by Paradox, whereas on the opposite side you have Victoria 2 and the HoIs.
HoI3 vs HoI2. It’s a bit like EU3/4 in the sense there’s no clear winner. HoI2 with the latest improvement like Arsenal of Democracy or The Darkest Hour is definitely a contender for HoI3. The biggest negative point is the engine itself, but HoI3 is more a mess of design and execution. Also, HoI3 was terrible at release. It simply was utterly broken. It took patches and expansions to make it even decent, yet lots of those design decision go directly against the fun (like the neutrality feature). So HoI3 is a worse game not because it’s unfinished or because of bugs, but because it has a worse design.
HoI3 is a worse game than 2 on many aspects. Being “fiddly” is not one, since you can automate every part individually and even play the game hands-off. That’s a perfect ideal of the control a game like this should give: you decide yourself whether to unload things to AI, or have a manual, detailed control. It’s choice. The problem is that HoI3 also built walls around player choice, which negates directly the fun since you try to do something and you find out you can’t just because you crash against one of the many “invisible walls” the game design has built. As Italy you can’t even annex Ethiopia at the start of the game, which is what actually happens historically. Everything is hardcoded. Who you can attack is hardcoded as if you play Risk and the game itself tells you where to attack, you just roll the dice.
And even the tech tree has been purged of personality, becoming just a list of linear bonuses and the removal of the national industries.
As for dumbing down we went from this:
http://gamersgate.http.internapcdn.net/gamersgate/screenshots_img/DD-IRCR/167242_ironcross_screen_4_medium.jpg
to this:
and now this:
So I’m a little worried.