I was always more of a DC guy until a few years back (that's a rant for another time that I am always repeating) but honestly, I am just a big fan of the world building.
Saying that, I think that after the first Avengers film, the bloom is off the rose, not because of quality, but because that was a leap into a joyous unknown that we never believed would really happen.
Now, though? Here's the twenty-odd films we're releasing over the next five years, including titles that are basically spoilers of everything that happens in all of them. Have a good one! Some of the joy is gone for me.
Also, I saw Guardians, and it's good fun, but I wouldn't put it on the same tier as Avengers at all.