Up until last night I would swear up and down that Die Hard or T2 was the best action movies ever but hell no it's not even close unless you have seen John Woo's Hard Boiled. It was seriously one of the most bad ass action movies I've ever seen in my life and holds up quite well today since it came out in 1991 or 92. The entire Teahouse opening shootout is amazing and will leave you're jaw wide open until the end. I would honestly say it was the best overall shootout in a movie (yes better than the Heat street corner one or Tony Montana's death) it was that sick.
I highly recommended you buy any 80's John Woo movies but start off with Hard Boiled you can pick it up from Best Buy for like $20.