Hectix777 said:
(grind is the bane of gaming!)
In an FPS, you kill enemies to advance. There is no different playstyle.
In an RTS, you build your base, build you army, and kill the enemy base/army.
In a racing sim, you build up your car, and race other cars around a track in order to unlock more upgrades.
In a Zelda game, you go to a dungeon, find the weapon used to solve nearly all of the puzzles/kill the boss in that dungeon, whilst collecting keys, maps, and a compass, and then move on to the next dungeon to do the same thing over again.
In a hack'n'slash, you kill hordes of enemies to advance through the levels, usually ending up using one or two moves over and over again.
In a puzzle game, you solve puzzles again and again to advance.
In an RPG, you level up my gaining experience via doing quests, killing monsters, or, in the case of some MMO's, killing other players in PvP.
In a game such as the Sims, you wake your Sim up, have it do its everyday work, and put it to bed.
In an Adventure game (a la Kings Quest), you click on everything in every frame and use every single item on everything until something works to help you to advance.
All of these are examples of grind in games. All of them require you to do pretty much the same thing again and again in order to advance any farther in the game. So, what I think you mean (Which will turn your whole argument around, not that there really was one to begin with seeing as WoW and Guild Wars are two MMOs on the absolute opposite side of the spectrum) is that grind is the base of gaming. Every game incorporates some sort of grind in some way or another.