Yes, there are objective facts. Whether a waveunction is made of 2 components or 1 is still not independent of your perspective. No, it's not necessarily nonsense. I am just claiming that the unsolved problems of stuff like "overlap" are not due to a lack of information about quantum mechanics, but due to a lack of information about very complicated things humans do. If it the difficulty of understanding how humans categorize things and revise categories gets attributed to basic quantum mechanics, then we may get some nonsense.
You say there are objective facts, yet you claim it depends on ones perspective...this is contradictory. Have you read any of Wilson's papers? Or Saunders, Lawhead, Ismael etc.? All have written papers clearly indicating the OBJECTIVE difference.
http://www.scottaaronson.com/blog/?p=1103
Eliezer's gung-ho attitude about the realism of the Many Worlds Interpretation always rubbed me the wrong way, especially in the podcast between both him and Scott (around 8:43 in http://bloggingheads.tv/videos/2220). I've seen a similar sentiment expressed before about the MWI sequences. And I say that still believing it to be the most seemingly correct of the available interpretations.
I feel Scott's post does an excellent job grounding it as a possibly correct, and in-principle falsifiable interpretation.