Quote Originally Posted by Viking
See this thread why the guild missions should be executed still:

Daveybaby's Guide to Guilds
I know that, but the only one that even remotely justifies doing the mission, would probably be Merchants Guilds (for the trade income increase). All the others, with exception to the Explorers Guild (easy enough anyways), you only really need 1 or 2 high level guilds for the global effect (and the second one just for convenience in location).