Here is an old radeon vs. fglrx test I did. All those games a rather playable. Would like to know what you did to get Tremulous running though; it's a slide show even under masa 7.8, and tends to crash.
Agree on the graphs not been that hot. Having all those thin colored lines close together is hard on the eyes.
They probably just didn't want to spend time on testing and measuring things that would be so bad as to be useless to just about everybody.
It's not as if they hid the fact.