The D% games have too much resolution in their RNG -- nobody can distinguish between a +7% and +6% modifier to a roll without seeing numbers (ie, if you just get a sequence of success/failures, the time it takes to distinguish between them is on the order of 10,000+ rolls). Even d20 resolution is too high that way, but d% gets ridiculous.
There are also the problems approaching and passing 100%, where the house rules breed, the options multiply, and everything gets crufty -- which also happened when someone approaches 100% in a defence skill. Then again, it wasn't RQ3 that I played -- it was another RQ revision number.
I also had fun playing traveller. The solar cells that manage to extract more energy out of sunlight than passes through the area of the cell are amusing.