If Dante didn't have the amount of I-frames in his moves he does or Royal Guard, then I'd agree with you.
I think you need to take a step back from your haters gonna hate perspective. It's not outrageous to expect great successive playthroughs and difficulty. That has been a staple of DMC, and is something to be expected.
If the game doesn't have replayability that is one thing. That's true of many games (even many good ones). But the way some of these people complain about how bad the game is and then also go on to complain that they don't even want to complete multiple plays on higher difficulties is the part that is silly.
It's like they want to two things simultaneously: assert that they don't like the game and also assert that they have critical authority since they have played the game a whole bunch.
If you have beaten a game and continue to play it despite claiming to dislike it, you are either stupid for continuing to play a game you don't like or a liar for pretending you don't like it.