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This is strange, I think I've only started one other topic ever on this board.
Before people say "Now this was a useless post", this is meant to help clear up some of the confusion for people thinking the game "lacked content". Not that anyone who's thinking about purchasing the game will ever read it. Also this is for those who enjoy PvE more than they PvP.
Also, even with any enjoyment of exploration, you may still not enjoy the game. If you dislike the combat, there's nothing you can do to make the game more fun for yourself. Always do extensive research before prepurchasing the game.
Anyways, one thing everyone's going to need to understand when purchasing GW2 is that the game is especially designed for explorers. While you can stay in one area and until you hit the required level for the next area, you won't be taking full advantage of what the game has to offer. I have seen numerous posts where people went in talking about repeating so many dynamic events and just staying in one area while they leveled, or just following the hearts.
The hearts are only meant to guide you in the right direction, and to be something for completionists. They are not meant to be the main content. ArenaNet added scounts and hearts to help those who just don't know what the heck to do in the game. They even added the event panel because in testing, people had no idea what to do. Just because the game says you "completed the zone" doesn't mean you actually completed the zone. There may be some hidden dungeons (yes there are open world dungeons so to speak, filled with puzzles, traps, and tough mobs).
Before someone says "you are still limited by levels", yes in a way you are. However, if you hit mobs that are a little bit too high for you, turn around, or waypoint back to a certain spot and pick a different direction. I remember I participated in events that not many on my server appear to participate in. For examples, I protected honey bees from bears seeking the honey. As a reward, I was able to purchase a jar of bees.
I also was a able to kill a large fish boss (the mesmer underwater skills are freakin awesome), and as a result got access to a fish merchant. I didn't even experience every event. There are people who talk about certain events that I have no idea what they are talking about. And since some events only happen during the day or night, it'll take a while to experience everything.
I've seen many people with similar experiences. I've also seen numerous people say that they went though leveling without ever repeating a dynamic event. I remember I went back to that starting farm area in Queensdale waiting for the queen worm event to happen, but it never happened for me. Neither did that Shadow Behemoth. Nor did the Broodmother.
And since ArenaNet has stated the intend to continue to add new events throughout the lifespan of the game, but never tell anyone, you can't be afraid to go explore lower level zones occasionally.
The game rewards incredible amounts of exp for exploration, so you won't be gimping yourself by walking off in a random direction. I might recommend not opening your map at all.
To sum up this post:
If you don't have the explorer mindset, this game may not be for you. If such is the case, I wish you the best of luck in whichever game you choose to play.