Haven’t seen much of RDJ outside of the MCU, but as far as favorite Iron Man movies? The first one was cool when I saw it in theaters. What hasn’t been said. It was a nice starting point for the MCU and Iron Man.
The second one I didn’t hate, but it seemed rather forgettable.
I recall liking the third one more than the second. I did think it was weird how Tony seemed out of his armor so much, and there was the Mandarin reveal. I was introduced to the Mandarin by Iron Man Armored Adventures, where he was pretty strong and tied to magic, so him being a regular guy was odd. The arc of Tony trying to grow stronger without full access to the armor was kind of neat in hindsight though.