You know,
I love Monkey Island, but I think that any game based on
story/characters made by R.G. and a bunch of great graphics artists and an awesome composer would be great for nostalgic people.

He showed the world, more than anything else, that also gameplay could become good story-telling, and just focusing on what you DO in the game could be enough to entertain people both at emotive and intellectual level.
Story, characters and graphics art enhance that, of course.

In other more recent adventure games, story telling is done just by... story, art and, in the best of hypotesis, characters; so I think this is the reason why they doesn't satisfy us like Monkey Island.

I really hope that R.G. would make another adventure game, not necessarily MI3a.