Also, I thought Winter Soldier struck the best balance of all the Marvel movies so far in what you are referencing.
I agree that sometimes they go over the top, and while the MCU films tend to go beyond being simply Blockbuster films, that's honestly all they are to me. I like a good laugh, and I rarely do repeat viewings, so I never give it the opportunity to get old.
This is also the reason I have really enjoyed the DC films. They are just Blockbusters to me, to provide me with kickass entertainment for a couple hours out of my week, and they do the job.