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out of the 24 servers, 13 are full at peak times, with never less than 6 full and never more than 3 medium. this game is growing every day. this just blows my mind. im glad people are giving it the attention it deserves. at the very least, this shows that ANet made a FUN game.
raiders and power gamers will question its longevity, and may play less at 80 due to a challenging and "unrewarding" endgame, or lack of pvp skills/interest, as evidenced by XFire stats. however, only a small portion of GW2's player base uses XFire (probably only those who care to show off their /played hours, i.e. power gamers), and a more accurate estimate of the pop would be server pop categories show in World Selection.
all in all, glad to see the game growing. im not even halfway through the pve content, and im already looking forward to new DE's (and current ones getting scaled properly, no sense denying it's a problem). i may be in a minority on these forums when i say that GW2 has a long life and a high user count ahead. see u in Tyria.