First play through ignore the grading system. I know I’m going to get a crap grade - I need practice, upgrades, moves unlocked etc. I will only worry about that system on a second play through where I know exactly what I’m doing and now I’m ready to try perfecting it. At that point I must still be enjoying the game and the challenge of doing better. Most games I never do this, but some of them are really fun. I think if you worry about the grade right away its like skipping classes and homework and going straight to the test. Yeah, you’re probably going to have a rough time.