You say DMC but it sound like you're talking about DmC
I've played the demo of GoW:A and it seemed like more of the same and it kinda ran slow (most probably because I played it right after Rising which is faster and runs at higher FPS). I felt like the demo dragged on forever and I was happy when it ended... I don't know why because I liked the previous God of War games but that's what I felt like with this one.
I've played and finished DmC on PC only on Nephilim mode. I tried to play it in a way that I would make the most use of the different moves and stuff available and without resorting to the extremelly easy ways to get SSS in fights or using the glitches present in almost all levels to "fly" around the levels to finish missions extremelly fast but still... it was far from being as good or as exciting as the previous games for me and I thought the boss fights were kinda bad... almost as bad as DMC 2 boss fights with the exception of the final boss (as long as he doesn't glitch and stays frozen in the air or something like that). Never replayed the game on any other mode because... I didn't really like it :S
I've actually replayed MGR:Rising multiple times already (over 29 hours played and that clock doesn't count a lot of things so it's probably a lot more), finished Revengeance mode, cleared all VR missions getting first place, etc... and I'll keep playing it until I get all trophies...
I liked Rising, I liked the enemy desing, the boss fights were epic and pretty well designed (though I wish some of them lasted longer), the soundtrack is really cool, there are tons of stuff to unlock, lots of easter eggs, really funny (and a lot of) codec conversations, combat system is good (though it could be a bit better by adding some stuff like a better lock-on, realtime weapon switching mid combo, more combos for secondary weapons, etc.)
I think the cammera needs some work though, it can be crappy at times... specially when you consider that the parry mechanic depends on direction... and if the cammera is screwing around then it's harder to parry :S... the auto adjust of the camera is really bad... sometimes I have to keep moving it just so it doesn't auto adjust.
Well, whatever... none of them is perfect and at the end of the day, the game that makes the biggest profit is the most successful business wise, lol.









