I've been having problems with the PS2 controllers for the past year and I can't figure out if it really is the controller or the console.
I've tested 3 different PS2 slims. I've tested brand new sealed controllers, used controllers, and even 3rd party controllers. All the same issue: buttons need to be pressed hard for the input to be read in the game. For example the "Right" button on d-pad or X button have these issues making it annoying to play fighting games when I want to jump forward but it only reads the up press and not the up-forward press. Or when I want to throw a Hadouken in Street Fighter but only a punch comes out because the game didn't read my d-pad motion.
Is there any workaround to this issue? Anyone else went through this and have solutions? Maybe PS2 controller cords short out easily, or the rubber underneath the buttons is messed up. I can't figure out what causes this.