At start it's just awesome, you can't get enough of it. That is while you are in charge of Nero actions.
Thus, I couldn't wait to take control of a Nero-character again... unfortunately it happens near the very end of this pretty short game (I spent ~ 11 hours). Mixed feelings after all. If not the repetition (GameSpot guys say it right - some Bosses you'll face for 3 or even 4 times) and the weakness of Dante in comparison of Nero I would give this baby solid 9.5 or even 10, it deserves it.
P.S. Best cut-scenes in history. Even MGS-series can't compete, in my opinion (still wonder about 4th installment, though).
P.P.S. Nice replay value. FAQs say on the higher levels of difficulties not only enemies become stronger (and you weaker), but also they obtain new kinds of attacks and they appear in different places and in different amounts.
P.P.P.S. Devil Bringer ROCKS!