World of Warcraft isn't a ripoff of anything...its an MMORPG. There are about a gazillion of them. RuneScape sucks. Most of the people there act like n00bs, it runs of Java, the gameplay is tedious at best and hacking it isn't the hardest thing in the world.
"Darn it, I am not a level 57 so I can't chop down this TREE"
Guild Wars and WoW are great as is City of Heroes/Villians.