There's a few of these that immediately come to mind, like the Oblivion one that was 12 hours long or something.

I think it would be much better if the first section of the analysis was a brief rundown of the game and its content, and then the rest of the video was devoted to certain themes, where those themes take place (by bringing up some parts of the content in more detail) and how those themes are used by the game developers intentionally or unintentionally, but that's considerably more work than just narrating over a Let's Play and saying "This is good" or "This sucks"