WoW... lots of things to consider if you're thinking about playing it. Now, I have a level 73 character, so this advice MAY be biased. If you have any experience with MMO's prior to it, you will most likely not find it too difficult. It's repetetive, yes, but that's to be expected in an MMO. It's also addictive, but if you have an ounce of self control, you'll be able to keep yourself from playing 24/7. People avoid it like the plague because they hear the stories on the news about kids killing themselves over having their character deleted, or people staying up for 5 days because they can't stop playing it. Those people make up what, 0.1% of the WoW population?
The first 20 levels or so are boring as fuck, but once you get to Hillsbrad Fields (as Horde), it get's fun, as well as frustrating. People on the opposite faction will not hesitate to kill you the moment they see you. It's a very competitive game. It's very much like real life, which is what I think interests so many people. There's so much more to it that just levelling up. There are thousands of Guilds and a thousand times more people, some will piss you off, some you will like. There's an auction house which functions very similarly to a real market. You buy and sell things, the more there is, the less it costs, the more people want it, the more it costs. You have to learn how to cooperate with other players for group quests and Instances, which are 5 man dungeons full of elite monsters and usually 3-5 bosses.
A lot of people are unwilling to try it because they hear that it is nothing but 13 year olds. That's the Alliance. And yeah, both sides have 13 year olds, just the Alliance has more, but there are going to be people you don't like anyway. The majority of the people I run into are just normal people. Saying WoW is terrible because it's full of 13 year olds is like saying jobs are terrible because there is always someone annoying in the office. Okay, maybe not exactly, but you get my point.
WoW isn't really all that expensive either. $15 a month. Sounds like a lot. But look, that's $45 every 3 months. You could spend 45 dollars for a game that you will probably play for 3 months, or spend $50 on an Xbox game that you won't play longer than a month. If you can afford 40k, you can afford WoW.
So yeah, WoW is a pretty fun game that has a bad reputation with a lot of people. If you find you're bored a lot, try it out.
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