You could add a few in, but that list really is intended to just offer the main plot points: who are all these characters, how did they get to where they are before Infinity War, and what the heck are these infinity stone thingies. I think everything outside of that list is for colour and context about the MCU.
As far as Iron Man goes, you get to know who he is well enough in Avengers 1 that you don't desperately need his backstory. I'd definitely put Avengers 2 on that list before Iron Man, because it gives more Iron Man backstory, as well as Vision and Wanda backstory, and sets the stage for two other movies on the list (Civil War and Thor:Ragnarok). But six movies is already kind of a lot as an "MCU Crash Course".
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