My brother in law appears in 47 Ronin (extra), and even he said that the film is terrible and only recommends it if you're a big fan of Keanu Reeves.I'm not holding any hope that it's remotely historically accurate either. So it's on my "watch it when it's available for rental" list.
Robocop on the other hand is something I'd like to see... not sure if I can though.