There are a couple of RP realms that have reputations.

Moon Guard has the highest population, so it's relatively easy to find people to RP with. The drawback is that there are so many different styles of RP (and some are really "out there"). So while it may be easy to find RP, it's not so easy to find RP that you'd be comfortable with.

Wrymrest Accord has the newest population of RP realms (as it was added for Wrath). Some say it's the best realm for a new roleplayer.

Personally, I've done well with playing on one of the original RP realms. RP is not usually found going on at any and all times, but RPers are there and can be found, despite what the trade-chat trolls say.

Props to Mj for being a unabashed roleplayer!

- "The drawback is that there are so many different styles of RP (and some are really "out there"). So while it may be easy to find RP, it's not so easy to find RP that you'd be comfortable with"

Translation: Stay away from the Goldshire Inn. As Master Kenobe once said, "You will never find a more wretched hive of scum and villainy."

Check out Twisting Nether if you're looking to RP; both sides have pretty active RP communities, and the central hub of the Twisting Nether Gazette to coordinate things and keep the community in touch with each other.

I transferred here back in March from Ravenholdt where RP was all but dead Alliance-side and don't regret it for a second. The community is solid, and there are some great established guilds that really foster the RP spirit, such as IS (I may have only joined a few weeks ago, but am proud to be a part of this guild, they rock. :) )

I play exclusively Alliance on Scarlet Crusade, which is an RP realm. I don't RP. I will never RP. But when I transferred here (without any rl friends, and not knowing any folks on the server), I did so to escape trade chat idiocy and the masses of annoying players that seem unavoidable on some servers (I'm looking at you, both horde and alliance on Spinebreaker.) I have to say, I've loved it. I've joined a fun guild, filled with good people, and I'm getting the RP server experience without the RP that I was expecting when I transferred. I see literally zero RP on the server, but through my research, I know you can find it.

I have to point at Feathermoon for being, in my experience, the nicest, most mature realm in the game.