Skill can only take you so far. Cap has no where near the strength to hurt Thor and Hulk.
Sometimes sacrifices need to be made for storytelling purposes.
In Avengers there's a Thor Vs Iron Man battle, then Thor Vs Hulk. So, if Thor could fight with Hulk, and Iron Man can fight Thor, and (in Civil War) Captain America can fight Iron Man, does that mean that Cap could fight Hulk also? He can fight Spider-Man at least... that Spider-Man who can hold the broken ship...
The power levels makes no sense in those movies.
AT ALL.
In Avengers there's a Thor Vs Iron Man battle, then Thor Vs Hulk. So, if Thor could fight with Hulk, and Iron Man can fight Thor, and (in Civil War) Captain America can fight Iron Man, does that mean that Cap could fight Hulk also? He can fight Spider-Man at least... that Spider-Man who can hold the broken ship...
The power levels makes no sense in those movies.
AT ALL.
IM was at 475% power when fighting Thor
Also, just for the sake of saying, power levels fluctuate just like a normal person has 'good' or 'bad' days. Some days I'm soooo tired and slow, others I'm up kicking my duties butts. I'd imagine those fluctuations would be even bigger with more power.
I didnt mean to exactly specify power levels, but to know to some extent the limitations of characters. Like cap can lift about x amount and run about y km/h fast. that way you can have moments where certain heroes cannot handle a certain situation and they need their team members.
The whole point of a hero is overcoming what seem like impossible odds.