They took some elements from those games and applied it to Halo.They have daily quests, a color-coded loot system, weekly events, raids, and instances. It's very clear they had mmo's in mind when making this game.
Not to mention, pre-release there were interviews in which they compared the game to WoW and EVE(ha).
Adding those elements to another type of game isn't a bad thing. What makes it work (for me at least) is that it doesn't actually PLAY like an MMO.
For me it's PSO + Halo