The zones are pretty big. I watched a fireteam on twitch explore moon for an hour and never reach a dead end. Now for moon there should only really be one zone anyways, its the moon Lol I believe other zones and possible new planets will arrive as dlc. Some people expect way to much out of games. If they concentrated on more zones but only gave us earth, moon and mars you'd bitch about that.
Some companies hype games way too much. You can't control everybody's reaction especially if you're advertising contrary to what the product actually offers. Just sayin.
Naw companies are supposed to over hype for sales but that video is nothing to go by. All he says is the land is actually there he also says that he was just informed that if he trys to go that way he'll die. He clearly sounded confused at times and was just used to play the game. Either way don't buy it if the game doesn't meet its hype in your opinion.