Little late on the reply to this topic, but hopefully it'll still be of some help to someone. Personally I loved all the DMC games, still play the original from time to time even. DMC 4 is pretty fun. There is a fair ammount of backtracking, being as you actually play with 2 charcters (Nero and Dante) but if you can get over that, you're good to go. I haven't played 2 or 3 in some time now, so I'm basing my opinion off the first one here, but I found the bosses somewhat more challenging, which was a refreshing change. (Not overly difficult, but not a cakewalk) Bought my copy the day it released and haven't regretted it since.

Well while I can't speak for everyone, in my opinion its well worth the purchace.