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I played this for a while with a couple of friends and got to about level 50, and got extremely bored. But that's just me, my attention span for MMOs is very low as I've played so many. Guild Wars was a different and welcomed change to the traditional MMO, but I don't think it deserves the number one spot in any way.
After 50 levels I'd unlocked all of the skills I was ever going to use in the game. From then on I was simply killing enemies with said skills. At the start, the idea of changing skills depending on what weapons you have equipped was awesome! But then I came to realise after playing the game that I'd be stuck with these same skills until the end-game, which caused me to just lose interest and give up on the game. I was quite glad about it really, after finding out that the game has no real end-game content to speak of, and many people found the just hit a brick wall. I tried WvWvW and loved it! But after a while it became a bit monotonous, much like the skill system.
Rerolling and trying new characters didn't appeal to me... I'd played the classes I was interested in and still got bored of that. Levelling isn't what I'm interested in. I prefer competitive and challenging raid-type instances and a variety of skill sets to use. Guild Wars 1 did this perfectly in my opinion! I had a different set of skills for different occasions, with "Elite" skills I could unlock by completing certain objectives.
I really don't feel I got my monies worth for this game having played only 25 hours. I started of fun, and got grindy (Which I thought is what were trying to prevent?) Why is it at the top spot on most websites?!
[mod note - changed title to be less potentially inflammatory and better reflect the OP]