Too many to count. Iron Man 1 is in the running for being the best comic book movie. There's was so much potential for the series off that first movie but they just wasted it. I'll never rewatch a comic movie as much as I have the first Iron Man. I watched it so many times in theaters and at home. In my head I pretty much pretend the other 2 don't exist. Iron Man 1 is the only Iron Man movie. Avengers Iron Man was acceptable as well. Don Cheadle as War Machine is dreadful. Not nearly charismatic, fun, or masculine enough. I don't buy him as War Machine. And it always seems like he's acting.
Also Iron Man 1 Pepper = fun, refreshing
Iron Man 2, Avengers, and Iron Man 3 pepper = annoying
Iron Man 1 score also just a breathe of fresh air. So, so, so good.