Perhaps you should set it to your liking. To do this go into Mames GUI and select sliders. Press the ~button to help you see as you select each slider. Bringing down some settings clears the blur at best.
I’m convinced Mario is a hobo.
He wakes up everyday in the same clothes, runs around in sewers, and collects coins for a living.
At the end of the day, he uses the coins to buy mushrooms