[BrotherMan]

There is one thing that is common to all MMOs since the beginning of time. In at least one of the starting zones there will be a zone-wide broadcast chat channel in which you will be tempted to voice your opinion. Do not fall to temptation. It is an abyss from which there is no escape. WoW, being the most oft played has the worst example of such a channel - you need only mention or ask about Barrens Chat.

Imagine a chat channel that is home to the most idiotic, socially inept and libertarian viewpoints. Now multiply that by a thousand and you will being to understand how horrible and bottomless the trap is.

Other than that, playing in an MMO shouldn't be any more difficult than an internet forum, except with swords and magic. But then, maybe I'm special and have just happened to luck into the decent people.