Plenty of reasons. Starting with the core game play concept, through the failed promises, lack of content, unpolished content t content simply not working as it should or even not at all. WAR tried to be something between WoW and DAoC, and when something tries to please everyone it's bound to fail.
PvP was in terrible state at the first months of the game, several terrible imbalance issues (White Lions, Bright Wizards), the whole zone capture mechanic was clearly not working, keep sieges were pointless due to lack of incentive to defend them, public quest reward distribution was completely random (people who were at keep from start got nothing, someone who popped just for looting could get highest tier reward), quests were boring, PvE content was lacking, combat was not fluid and responsive.. the list goes on.
I admit, i have no idea how the game is now, but with MMOs if the first 3-6 months are crucial to the game. WAR simply failed to respond to the issues fast enough to satisfy it's initial playerbase, considering WotlK was released just 2 months later pulling back big part of the MMO crowd.
Having a decent IP basis does not make a game good.
PvP was in terrible state at the first months of the game, several terrible imbalance issues (White Lions, Bright Wizards), the whole zone capture mechanic was clearly not working, keep sieges were pointless due to lack of incentive to defend them, public quest reward distribution was completely random (people who were at keep from start got nothing, someone who popped just for looting could get highest tier reward), quests were boring, PvE content was lacking, combat was not fluid and responsive.. the list goes on.
I admit, i have no idea how the game is now, but with MMOs if the first 3-6 months are crucial to the game. WAR simply failed to respond to the issues fast enough to satisfy it's initial playerbase, considering WotlK was released just 2 months later pulling back big part of the MMO crowd.
Having a decent IP basis does not make a game good.