What makes mobile controls actually good
Great mobile controls are almost invisible. You stop noticing them, and that's the goal. Bad ones remind you constantly that you're poking glass with a thumb, and no amount of good design elsewhere fully recovers from that.
The first rule is big, forgiving touch zones. A button that looks tidy but is three millimetres too small will cost you a race at the worst moment. Good games cheat the hitboxes slightly in your favour, and you never even notice them helping.
Second is keeping your thumb out of the way of the action. Nothing important should live right where your hand covers the screen. The best racers and action games push key visuals toward the top and sides for exactly this reason.
Third, and most underrated, is honest feedback. A tap should do something visible or audible immediately. When a game responds instantly, even a simple one feels satisfying. When it lags half a second, everything feels broken.
Next time a game frustrates you, check whether it's really the difficulty or just sloppy controls. More often than not, it's the latter.
