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. :p 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. :p
Robocop on the other hand is something I'd like to see... not sure if I can though.