I think you're missing the point. It's not just paranoid fanboys trying to downplay a game that is similar to a game they like. Dante's Inferno is damn near a carbon copy of God of War's mechanics, only wrapped in a different skin.
There's a difference between a game being in the same genre as others (DMC, GoW, NG) and a game being a direct clone of another (DI, GoW).
Even GameSpot ripped into Dante's Inferno for the games wholely unoriginal ideas in its 6.5 review:
Also, it's highly debatable whether Devil May Cry or God of War is the better series. One focuses more on the intricacies of combat, while the other focuses more on presentation/story and incorporates puzzles heavily into the mix. If you want to argue about which has the better combat, I'd say Ninja Gaiden takes the cake.