Action sequels, like most movie sequels, tend to just rely on repetition. Now that the original idea was well received, it's easy to fall into the trap of just doing more of the same, but bigger and more expensive. The best sequels, however, are those that recognize you can't just do the same thing again and go in wildly new directions. That's why "Mad Max: Fury Road" is widely considered not only one of the best sequels ever made, but one of the best movies ever, period. Likewise, "John Wick: Chapter 4" is cut from that same cloth of not...