I don't mean to stir the pot here, but as a member of the Atlantic Roleplay community, categorizing the majority of the community as being drama queens is a terrible insult to the players who put their time and effort into roleplaying and interacting in character, holding events, and generally promoting fun and enjoyable RP.
I've played on Catskills and Europa, there are just as many drama makers there unfortunately. Roleplay communities tend to draw more drama than normal by nature, and unfortunately there is no roleplay mecca, where everyone interacts in character, avoids drama and conflict, and satisfies all of its members all the time, and anyone who says otherwise isn't telling you the truth.
Here is the simple answer to the OP's question.
Try roleplaying on several shards, and see which community fits your style. Taking some bitter words from ex-Europa RP community members, ex-Atlantic RP community members, ex-Catskills members etc... will only lead to the inevitable conclusion that Stratics posters always tend to come to, and that is that everything sucks and nothing is worth doing in UO. A futile effort in itself.
I've personally played many shards, I love Atlantic RP because of all the time and effort I've expended, and the fun times I've had with the passionate people who play this game. I was impressed with Europa's structure, and how strict and effective they were with keeping their vision of roleplay unified throughout their community. I enjoyed Chesapeake because of the sense of community everyone seemed to have towards each other, and the closeness of it's members. Etc... etc...
Each community will have its good points and bad, and only the individual can decide what's best for them through experiencing the different styles and interacting with the various personalities that make up each community.
I hope this answer helps.