Indeed, I for one think that Ninja Theory are trying to bring the best out of every game and put them in DmC. The architecture was actually nice in some parts of DMC2. Towering Gothic cathedrals combined with European influenced streets will almost always look good. It was only certain other parts in the game and the "corrupt" parts at the end that made the game feel rushed. The "demons in disguise" aspect was taken from DMC4. That game also had European influenced architecture, but that's to be expected after DMC2. DMC3, being a prequel (or a reboot, according to Reuben Langdon (I can't find the interview)) could get away with having only one tower with otherworldly interior design where the player spends almost all of their time. The jungle in DMC4, however, was not welcome in my opinion. Dark forests maybe, but nothing that bright. This isn't Sonic Adventure.
The free-form combo systems are in place, ensuring the combat doesn't get stale. It's not like Ninja Gaiden, Castlevania, or God of War that has you press "Light Attack, Light Attack, Heavy Attack". These combos allows the player to fight as they so desire. Let's hope it's polished to perfection by the time it comes out.