A few quick conclusions:
- The highest rated show is... Legend of Galactic Heroes.
- The best show you haven't seen is... VOTOMs.
- The best show no one has seen is... Fang of the Sun: Dougram.
- The worst show everyone has seen is... Gundam Seed.
- The worst show no one has seen is... Dancouga Nova.
I'll post the individual list of rankings below (both ranked by highest total rating and by viewership percentages). With 420 participants, this survey covers ~50% or more of /m/'s total population, and can therefore be considered a very reliable measure of the community's tastes. Full documentation of the survey can be found here.