Finished it. Took me 6:40. At least it was short.
Everyone says the last few levels are the worst, but I'm weird and actually thought they were the best (outside of the grindy ass final boss which is awful). Probably because the last few stages didn't have much platforming or instant deaths and the combat is easy and short enough that it never gets annoying. I mean it's still a better action game than No More Heroes 2 because at least here the longest "endurance" battle was only 5-6 mins instead of THIRTY MINUTES IN A PARKING LOT. The combat is shallow as hell and broken. I just tapped OOOOOOOOOOOOOO while dodging a little for the whole game. But at least everything is quick and doesn't overstay it's welcome.
The graphics never got good

There wasn't a single WOW moment. The 20 min GoWIII demo was more impressive than the entire game of DI. Hell I don't think it even looks as good as GoWII in the GoW Collection.
This game feels like they discovered it in a time warp. This game could have and should have came out 12 months after GoW1. It would have at least been acceptable then. Now it's just a dated crap action game.
At least the achievements are easy though I'm not sure where you can do a 666 hit combo. Probably gates of hell mode.
6/10