If I can just insert a little clarification here. You say that Blizzard's game is successful because it has no boundaries, but last time I logged into WoW I looked up and saw the moon and I couldn't travel to it. I mean it's 2011 and WoW doesn't have any astronauts?

But seriously: I fundamentally agree with you, we should be able to go anywhere and have the means to do so, but there ought to be some limits on it. It's good to be able to jump down off a ledge, but it's not fun to accidentally fall off a cliff. Give us protection from falling off cliffs unless we hit the jump button to confirm our death wish, give us rope for safely climbing down (and back up) things, give us boats and climbing spikes and the ability to climb a tree. Any terrain I can see, let me traverse or die trying.