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I've tried out many MMO's in the passed 4 or 5 years. Everything from Runescape to Guild Wars 2. I have noticed, however, that many MMO's are missing out on something that I love.
I love having skills like fishing, woodcutting, mining, cooking, etc. like Runescape has. Many MMO's don't have this. It's what keeps me going back to Runescape (plus the new combat system they're adding). I love how you could level up all these skills, make money off of it, and get better equipment/wood/fish etc. to make plenty of different things.
All in all, I just wish more MMO's had the type of skills Runescape had tha you could actually level up or at least something very close to that. It gives a more lifelike experience in the game.