Not exactly lol
Point was that other than in the minds of players (mainly WoW players) seems the themepark genre of games dont even really exist at all.
Even the WoW website dont claim its a themepark style game (once again, that I see atleast)
I'd really just like to see something on the net describing the themepark genre of games (somewhere other than forums that is)
Just searched STEAM (didnt think of that before) and the only results returned were actual theme park construction/management game type games.
Seems the themepark genre really just dont even exist.
The issue is not black and white and you will not find a concrete definition because each developer is different and most do not classify their games as such. Depending on who you ask you may get a few hundred answers on what type of game or experience defines each term, here is what it really boils down to and what most who have been around can agree on.
Sand-box: Player generated content in which developers give the community/players tools to create content and interact, shape, and change the game world around them. Most MMOs in the last ten years do not follow this model and most games in general do not follow this model.
-SWG in part, was one of the bigger "sandbox games" as you could create content in some forms in which players could interact with, the game world was also so vast that you could run in a single straight line for hours and never reach an "end" (Invisible wall). Exploration, or the lack there of, does not make a game sandboxy or not, remember that the word comes from playing with toys in a sandbox. It is what you make it out to be.
-Minecraft is the most popular sandbox game out and people do not even realize that it is. You create what you want, the world populates it with NPCs and blocks to build or deconstruct and the fact that you can run in the game forever (Until Java kills it) and see random generated content. If an MMO was built just like that it frankly would be pretty boring.
Theme-Park or On Rails gaming is what you have come to expect from games these days. Developers spend years crafting quest lines and stories in a logical progression model in which you grow as a character and play in their world. Most MMOs are like this in nature because people want structure they want a path of progression that is easily followed and understood. If a developer built a world and then just dropped you in, level one, nothing else you would probably quit after a few hours. You are strapped into the game world that the developers create, you have limited to no tools to change and shape that world in a permanent fashion. Could you siege a city? Sure, but its going to reset after a while and in the grand scheme of things does not make a difference at all.
Just because the world has invisible walls does not mean it could not be a sandbox game and vice versa.