ET offers rating on brokers, data vendors, software, books etc. But rate are missing for exchanges. I suggest ET to make exchanges available for rating by public opinions. Just a personal bet, some exchanges such as CBOE, PHLX, or even NYSE must come out with the worse feedback or lower score than others.
It's certainly worth giving a try. However, I'm not so sure NYSE will get the worst rating. Have you forgotten ARCA? Or do you define "exchange" only as a venue for trading stocks with more than 20% up-time?
AMEX is much worse than the NYSE. and i'm no fan of the ridiculous rules the CBOE has in place. i can't wait for the BOX to come online...