Matchmaking is very hard to do yes, but then I've never seen an FPS game attempt it. I imagine they will have to base it off of personal stats. Their accolade system will serve as a great way to figure out how much good a person is doing for a team, although there needs to be made a few adjustments, like returning a flag at a bad time. Killing people also has to be a little less rewarding. A pathfinder spending the entire game killing people in the enemy base isn't really doing anything good, because people respawn in 5 seconds, right next to where they died nearly.
To be fair, nearly all other games use 0% inheritance, except for some rare circumstances, like when flying helicopters and jets in games like Battlefield. No weapons in Quake or Unreal used it.
Tribes uses the inheritance system, because otherwise fighting at high velocities would pretty much be impossible. Most of the older games in the series also used 50%, which is basically why they are also doing it in T:A, even though there is large amount of people arguing for 100% in the community.
New trailer for the game:
[M]http://www.youtube.com/watch?v=pjyUy5f3VIw[/M]