I know the highlight reels are only showing his best runs, but those Winnipeg Blue Bomber highlights of his are actually pretty awesome. As other posters have said already, his quick cuts in the hole and willingness to run over tacklers reminds me of Rawls. And he's probably as fast as Lynch was in his last couple of years. The CFL style of football can favour smaller "scat" backs, so sometimes a guy like him with a more inside the tackles running style is more suited for the NFL than the CFL.
I'm certainly more excited about Marshall's potential to make the team as a backup than I am about the wide receiver from the CFL that we just signed.