Ok, so ive been plain Guildwars for a while, and im startin to get boredof it, then i saw an add for Everquest

and it seemed pretty cool, cause i saw it had like 16 cles... but im really confused, i went to Everquest.com, and im not even sure if its MMO, or anything, then i saw it had like 20 expansions, so im really confused. Can someone explain it to me? and tell me if its a good game or somethin?