I'm an RTS gamer myself. I don't play other MMOs for more than a few weeks/months because the fixed skillsets and grindy nature make me bored. Typical MMO endgame consists of grinding max gear. GW has no such thing. At best you grind for rare items that don't do anything other than "look pretty"

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The prestige weapons/armor/minis they have in the HoM (Hall of monuments) calculator is not representative of the game. None of those are required.
GW was different, that's why I still bother to log on albeit the skills haven't changed much recently. Back in its heyday there were monthly skill updates.
Most MMO games are structured in that if you can't kill a mob at level 40 you can kill it at level 50 or 60. The player doesn't get stronger, the character does. Guild Wars is completely opposite, since the low level cap causes you to think things through rather than to just get higher level to stomp the mob you couldn't kill.
So in summary, yes Guild Wars is fun the first time through Normal mode and Hard mode and PvP is consistently fun due to the dependence on player skill rather than stats. After a few times you might get bored because you already have seen it all but you can make a new profession to see it from a different point of view.