WoW is very big. thats a pro and a con. you got really much space and can discover the complete world in a year BUT you're walking for ages without pet it's also a shame that you got to pay for it free servers problem is: you get bored. its just more fun with millions of players. My point: dont play, it eats money
I personally hate the game. I bet it lags tremendously with all those players to. If, thus you have to pay, I wouldn't waste my money on any online game. I do believe this is true though.