I find it hard to believe anyone's opinion on the difficulty, really, since many of the people who want it to be soooo hard have played the game on DMD for the longest time, so by default their scale might be a little bit off. I've even been playing DMC3 HD again, and the harder difficulties are really only harder because the enemies deal a lot more damage, and of course the "Devil Trigger" the enemies get in DMC, but otherwise...they're really not that difficult. It all just gives you less room to make mistakes, emphasizing the whole "don't get hit, be stylish" thing.
And what's the point of telling me you can run through the demo with Osiris? That's just spamming one weapon, which gets stronger with each kill. Doesn't do a whole lot for your Style unless you snatch up a lot of enemies, and even if you do, that's something that could always be done in the classics.
Also - I do have to point out that this is the first Devil May Cry game where each of the S ranks are individual grades, and not just tiers of the top rank. Watching older TrueStyle gameplay from 3 and 4, S, SS, and SSS are all on the same "meter," with the higher grades only being further along the meter, instead of you needing to completely fill the meter to get to the next grade like D through S...not really any point, but I suppose getting a SSS in DmC is a bit more work on the meter-side, just because there's actually 7 full grades, instead of 5, with the highest having three tiers.