Yep, lights that are too bright on a MUP make it hard for anyone coming your way to see anything but your light, and therefore makes it more dangerous for all. Worse still is when there's a train of 2 or 3 all with lights too bright, approaching you.

If you have overly bright lights on a MUP you should at least have the courtesy to shield or adjust the lights as you ride by others - like high beams on a car.