For Sylvester Stallone, action films aren't just escapist entertainment: they're a venue for personal expression. His biggest rivals in the 1980s, Arnold Schwarzenegger and Bruce Willis -- who, by the way, both make memorable cameos in Stallone's new film "The Expendables" -- couched their ballets of napalm and testosterone in heavy doses of irony and sarcasm. They made silly movies that they knew were silly. Stallone, in contrast, was always defined by his total and complete sincerity. As ludicrous as they are, movies like "Rambo III" and "Over the Top" are grounded in genuine beliefs. I truly believe that Stallone thought he could single-handedly win the Vietnam and Cold Wars which, when you think about it, is a lot funnier than anything in the work of his more comedically gifted peers. "The Expendables" bears that same mark of earnest stupidity.