It depends. I for one loved DMC4 (it's actually my favorite game of the whole series), but before buying it, I built up a judgment by watching gameplay videos, reading commentaries and reviews from many different sources and just then decided to buy it. I'd have done just the same with DMC5 (just like I did with DmC, only that with DmC we had the advantage of trying out a demo) and if I decided I wanted it then I'd surely have bought it. I was never expecting DMC4's story to be any improvement from past games so if DMC5's story would have been on the same level quality that'd have been just fine for me.