If you have never play WoW here is a little description:

WoW is a massively multiplayer online role-playing game (MMORPG)…
As with other MMORPGs, people control a character avatar within a persistent game world, exploring the landscape, fighting monsters, performing quests, building skills, and interacting with NPCs, as well as other players. The game rewards success with in-game money, items, experience and reputation, all of which in turn allow players to improve their skill and power…

more at Wikipedia

1. Is a very addictive game:

Don’t get me wrong I love to play WoW. I think is a fantastic game. But if you are playing to avoid your reality, believe me that you will be successful and that’s not a good thing.You must learn to have a balance on your life. You must continue to live your life outside WoW.

See WoW as just a game and nothing more. You will probably make new friends but don’t forget your real life friends. Spend time with your family and kids. Keep your work; after all you have to pay to play right? But there are a a huge amount of players that become some obsess with this game that they start losing their partners, works and it can be destroy lives.So if you can’t manage to keep the balance on your life between a hobby, just a game and the things that are really important, then don’t play.

WoW can be a very time consuming game if you let it.

2. Lots of annoying kids:

If you decide to play. Welcome. The first thing you will find when questing and exploring is a very annoying general chat window and you will start to wonder:
- what the heck is that? Who are this people? Well that’s everyone on your server most of the time saying nothing important.
- What are they talking? Noob? LF1M? Whant to but +8 AGI? What?
- Am I surrounded by kids? Yes you are. Not everyone is a kid but is hard to find some people to have adult conversations.

Once you start progressing in the game you will receive tons of invitations to join a guild. Go ahead and join one you like. I bet that is not going to be neither the first one nor the last one. But you will start to learn another aspect of the game.

This is a social game. You will interact with other players all the time. Actually that’s a good thing but watch out and don’t let the first impressions let you down because most of the times they will. Keep looking and sooner or later you will find some more mature and adult players.

3. You have to pay:

As with any other game you must have a computer, buy the game and play. But to play WoW you have to pay every month for your subscription. Is not just a game but a service you are paying. You payment allow Blizzard not only to be very rich but also provide the game with new releases. You will learn very fast what patches are.If you have a good computer with an amazing video card you will experience a very nice looking game. Amazing landscape and creatures. But you can still play WoW on your old computer. I played for a long time with an old video card with only 32MB of RAM. Outch, I know.

4. It can be very complex:

I had a friend the other day at home and he had never see the game before. I was leading a 25 man raid. He was next to me watching and hearing everyone on Ventrilo.

For him it was like watching a hockey game with players using a dime instead of a puck and hearing a conversation between Thomas A. Sebeok and Umberto Eco about pragmatic semiotics.Not only you will have to learn to play the game but also you will need to learn another language, statistic information, mathematics, strategy and after all that, some players will still call you a Noob.

5. Is a very addictive game and time consuming:

Did I mention this already? Well, I have to repeat it then. Don’t do it if you don’t know how to manage your time and your life.