I'll mention the discussion of "what makes Rebol different" and "how do you explain the value" has happened a fair bit...it's hard because it's weird, but people try. Here's an old post I've cited from DocKimbel:
Rebol's Target Market: Newbies, Experts, or Other? - #3 by hostilefork
Of course the devil's in the details of these examples with things like binding. But you might find interesting thoughts in those threads if you dig around.
I'm the wet blanket who says nothing is that notable about it if it doesn't work, so I couldn't really demo what I find fundamental about it in Red/Rebol2/R3-Alpha, because they're just missing too much.