- Of course I mean only in the MCU, but when you think of it Hawkeye is the most skilled Avenger.
In the MCU Hawkeye is the only Avenger that only relies on his own skill (I'll get to Black Widow in a sec). Iron Man has his suit of Armour, without that he's just a genius, millionaire, playboy, philanthropist. The Hulk is just an out of control rage monster and Thor is a freaking god. Everything that makes Captain America an Avenger comes from a bottle.
Now, Black Widow, In the most recent Age of Ultron trailer it looks like she's being experimented of so maybe that's where she got all of her skills from, even without that I would argue Hawkeye is better, he can shoot an arrow into a USB port! I bet Black Widow can't do that. Though she did kick his ass when he was Loki's bitch, but he was Loki's bitch he might not of been at his full potential.
Now onto Age of Ultron to see if he is the best Avenger.