Seattle’s Monday Night Pinball put together a neat rating system (IPR) that uses a composite of IFPA and Match Play Ratings: http://www.wapinball.net/mnp/ratings.htm
The general gist is that a team is capped at a total of 40 IPR.
Individual’s IPRs (anyone in the IFPA or MPR DBs) can be looked up here: http://pinballstats.info/search/
I wanna say the credit for most of this goes to Michael Adcock, but @dbs can correct me if I’m wrong.
I haven’t heard many other opinions on it, but the limits seemed fair to me.