The only MCU movie I watched in the theaters was Captain America. I had seen Iron Man and Thor on tv or rented them, but I was never "into" those movies back then, and had no idea they were all connected. So I wasn't part of the masses that watched them all when they came out in the theaters over a 10 year period. I went back and started with IM1 and watched them all pretty much for the first time on D+ in January 2021 when I was sick with covid. And that took about 10 days. Trust me....Endgame had an impact on me.