Overall, it turned out great. The best part about the MCU is their ability to rework heroes from the comics that I've disliked or been ambivalent about into truly great characters.
I have some nerdy nitpicks that will probably always bug me though:
MCU Hawkeye is so lame. Completely missed the point of the character. Wheedon basically just used him as a prop in AOU just to contrast the dysfunctional Avengers with his perfect little family. Very exited to see this take on Ronin though.
Pym should have been involved, in some way, with the creation of Ultron.
Falcon debuted
strong in Winter Soldier but has been shoved into the background for the past 5 years. I guess there's the Disney+ series coming.
Among the million other things wrong with the third act of IM3, we should have gotten MODOK.
Really want Abomination to return.
That's pretty much it other than some timeline flubs that just didn't need to be.
X-Men 3 - that was rough. I would never have thought we could get something as good as Iron Man after that stinker.
Unpopular opinion, but 3 was far and away the best of the original trilogy.