Me and my guild were attempting to do a guild puzzle and due to the Mega Servers we were not able to do the puzzle at the time we wished to start it, for our own guild points because it was started under another guilds tag, Which is incredibly frustrating because sometimes some of our guildies run on tight schedule and now we have to spend our time that we wanted to play waiting for the some other guild to get done. this is unreasonable and a complete fail on the whole idea of Mega Servers
It would be nice if you could create the guild missions like dungeons, where we can start it when we please and not have to wait for other guilds to get done.