I think this thread is very much a preemptive strike in the vein of Infamous vs. Prototype. In short, this is one of the most pathetic threads I've seen in a long time.
First off, if this isn't some petty fanboy defense, why don't we have this discussion on every 'flawed' game? There's plenty of them out there. Second, even if oneself truly believes that DI is nothing but a GoW ripoff, why is this necessarily a bad thing? So... people get more God of War... yeah, WTF is the big deal? I don't get it... Where I come from, more=better.
I suggest instead of complaining about 'which mechanics from where!?' people simply play games and enjoy what they're given. Personally, I like having more western hack n' slash available. I think it helps to level out all these Japaneses games that I don't like such as Bayonetta.