Re: What is your favorite "final battle" in the MCU?
I am actually going with Ironman v. Iron Monger.
There was some actual tension in how it was going to resolve. Of course we knew that Ironman would win, but there was some complexity to the sequence.
Avengers was an absolute joy-ride, so I won't debate its awesomeness... but I do pick Ironman as my favorite final fight in the MCU.