I dislike the amount of crytasism given to Spielberg. It is true that as a producer he is responsible for a vast amount of crap reaching the screen. However, he is primarily known as a great director. He is undoubtably one of the greatest American directors of his generation. Although many of his films are examples of Hollywood film making, he is also capable of highly origional cinema (Saving Private Ryan practicaly re-invented the rule book on war films). 
 I think that Spielberg is one of the few directors to sustain a high level of quality in his films, and is (open to controversy) a director to rank alongside Truffaut, Leone and Kurosawa.