That's about right too. Try loading and playing Tribes2 in opengl...
It plays fine...
If you are talking about the Black screen issue with AA enabled that is an Application issue with the way Tribes accesses the Back Buffer on screen refreshes. I had a long chat with one of the Driver guys about it. He played Tribes all the time and couldnt find a work around.. so go figure..
This is the same kind of issue as the Splinter Cell AA problem. Its different but application related. The problem is that dynamix no longer exsists to address the problem.