My thoughts are that beef is way to good to try and change the flavor. Unless you are talking Mongolian beef!
I will marinade but not inject with the marinade. That little added flavor around the edges of a piece of sliced beef complimments the beef taste wonderfully. I like mixing Montreal seasoning with whorchester, a little olive oil, and a touch of soy sauce. This is pretty tastey combo, but I dont think I would want it injected all the way through the piece of meat.
Beef, to me, is for lightly dipping in an au ju or other sauce/ gravey.