Last weekend I played the pre-release for Return to Ravnica. It went very well. I decide to use Rakdos for my guild, The logic being that to my knowledge not many people play Rakdos. As it turns out almost everyone used Izzet or Golgari, Why I don't know but more on that later. I was 2-1 on my first game and 1-2 on my second and third, I almost won the second one but a stroke of luck on my opponents part just barely let them beat me. I could have stayed for a forth match but it was getting late and I did not have any shot at first prize. All things considered I did well keeping in mind the fact that I did not get many good cards. I for one am looking forward to drafting the new set and am eagerly awaiting the release of Gatecrash.
Sidenote: I think people like Izzet and Golgari so much has to do with the duel decks of them that were released a bit before the set came out. Don't get we wrong though, They are good guilds, People just overvalue them.