Yes,sometimes I do.
But for me its only cause I haven't figured out what does what and when it does it.But then again,I feel like I am button mashing a lot most during klose kombat or the free fall.

I'd take a little bit of button mashing over the slow, unresponsiveness of MKD/MKA.

The only part of this game that is designed for mashing is Test Your Might when you smash through wall after wall. Otherwise, precise button presses work just fine, like Street Fighter.

I find my self mashing to try and make a basic combo come out. Like if I block and right away I want to come back with a 3 punch combo. I press PPPPPP just to make the first punch come out.

Usually, I try to stick with coherent combos.

i do the same thing after a block but that's the only time i find myself mashing a putton.

no, not at all.
but i have heard of that..... it called "yousuck" syndrome.
its a rare dissease but it sounds like youve got it.