Eastwood isn't garbage. Barely any actors are garbage. Eastwood in his films did exactly what was required of the film, the script and the character, which is what acting is about. You don't watch The Good, The Bad and the Ugly and say it was bad because Eastwood is in it.
I'm watching Star Wars II right now and it is cringeworthy. Yes the acting is bad but they are doing exactly what Lucas wrote and told them to do. It is the fault of George Lucas the film is shit not the actors. Rarely will bad acting ever sink a film, just like good acting doesn't make a film. Clearly if actors acted like robots it would be shit but hang on, why would a director or anyone else involved in a film cast an actor who acted like a robot, or keep a scene which was like robots talking?