I just clocked the 50th hour into this game, it's awesome, I'm already done with all modes except Hell or Hell (which I probably won't do, it looks too frustrating) though I have yet to complete the secret missions ( I have like 4 done lol) and the orb fragments.
Curiously, on Devil Hunter, Son of Sparda and Legendary Dark Knight mode playing Nero is harder than playing Dante (especially LDK, Dante has a LOT of area of effect attacks, he's insanely powerful for hordes) but on Dante Must Die, it's really all about Dante must die, Frosts, Chimeras, Berial and Angelo Agnus were not exactly a walk in the park and playing with Dante was much more of a challenge than playing with Nero on DMD and the inaccurate 360 d-pad sure didn't help but I've gotten used to it over time.
Anyways, this game is incredible, it's reminds me of the old arcade days where all you wanted was to hone your skills and beat your scores.
Oh and the PC version is definitely the best by far, I thought they were only minor additions but Legendary Dark Knight and Turbo are insanely fun and playing through the game again on LDK is a very different experience that requires different tactics so it's worth it.
Just needed to say that, this is a great game and a great port (it runs great, zero bugs, zero crashes, well optimized and streamlined for the PC and features significant extra gameplay content).
Hopefully Capcom brings DMC5 (it's inevitable) to the PC with all the LDK madness and turbo mode