Both films have to appease to the masses so you have to expect some degree of watering down. AoU was less watered down than A1.
I catch flack for bringing this up about A1, but they really dumbed down Cap in that movie. Banner and Stark were the geniuses. Thor was the non-human god (and the dumb jock to a degree). Hawkeye was the recluse loner. Cap by default had to be the 'every man' which means giving him some really bad lines in A1. I was glad they had him talk less in this movie - or at least it seemed that way.
Conversely in the second film, they had to hit the housewife demographic and show Hawkeye's home life which I thought they over played.
These are nit-picky things though. Both movies were still great.