I had the U-Force when I was a kid. I tried every game I had when I first received it. The only game that even REMOTELY worked was Mike Tyson's Punch Out... and even then, it was incredibly bad.
The operable range from the sensors was generally about 1 inch. I remember it being initially responsive, but you had to COMPLETELY remove your hand from the beam before it could register another input... and *then* it would lag on you on the next input.
The port where that joystick plugs in? Basically just a recessed notch over an internal D-Pad. You could stick your finger in it and control Mario! (That doesn't sound right...) And nothing physically held the joystick in that port; you could pull it out at will -- right in the middle of the game, typically.
Also, those great big red buttons on the joystick piece? They were spring loaded, and all they did was manually flip a reflective(? can't remember) paddle on the bottom of the handle which would then trigger the sensor below them... but again, only when you were DIRECTLY OVER THE SENSOR... kinda hard to play most games when you can't move and do an action at the same time...
You could even lay it flat (as opposed to that 90 degree angle) and access the sensors that way... but that was like playing with an awkward, over-sized, under-sensitive bastard Theremin on crack.
Altogether, it was like the devil design spawn of the Stanford Prison and Milgram Experiments. With a little Hitler thrown in.