Horde rock etc etc
truly alliance rp is centered around Stormwind and 3 or 4 guilds. Horde rp is everywhere you don't even need to look for it. If you rp with someone they will rp back in my experience.
Yeh 2GE (Troll rp guild) is a good rp guild, its a shadow of its former self though think Aisha has a char to give you more info.
A few CoREites are now in a guild called The Cult of the Void, which since joining Defias for me has been the friendliest guild there (Samson, Hew, Duo, Raistlin) well it was until Snubson joined
The Old lordaeron, another good rp guild this one strictly undead.
Orc's of the Red Blade, not much experience of them at all but general consensus is thumbs up, exclusively orc from forum comments think 1 of them is even ex GRD.
Mistrunner Tribe Tauren rp guild, also a shadow of its former self but still a good rp guild, Achenar of these forums could tell you more he's a member with his druid.
I won't mention Burning Dawn, they are nothing like they once were (first 6 months - a year after server launch) the best rp guild on the server. Still claim to be strictly rp, but I'm in a pve guild and we get alot of applications from Burning Dawn members who in their own words, aren't getting enough pve done in BD. (Bah...I mentioned them anyway)
also coming from
UO which imo is the best game for rping on the market
WoW is a shock, the rp there is totally different. This idea wouldn't work meta gamers would ruin it by refusing to duel you and non rper's (yes there are a fair few even on an rp server) would bitch and whine.
If you are into battle and pvp based rp alliance side, I suggest you join The Shining Strand or Starseekers, the latter being a night elf/draeni only guild. Both actively participate in world pvp as a guild.