The full section is a portage fest
described here at Jason Rackley's excellent
Oregon Kayaking site.
A short section of bedrock slides and ledges can be cherry picked, but even that section
described here is still a novelty trip at best.
Marion Creek below the confluence with Puzzle Creek looks like it could be worthwhile class III-IV that flows from snowmelt if it was wood free, but historically it has not been. Dangerous wood has been placed by the Forest Service, rendering this section a liability to anyone attempting to paddle it.