I do find the Avengers theme one of the more memorable bits of music from the Marvel films, and am not suggesting that the composers failed utterly. I just think it was a missed opportunity with the score to create something a bit more unique. The Marvel films overall can be described as 'adequate' rather than 'amazing!' or rather, people might point to Captain America: Winter Soldier and call it a good film, but for the rest, they're going to describe them as 'fun' or 'entertaining'....not 'good movies.' And the generic/background music certainly isn't helping there.
There's a difference between George Lucas telling John Williams, "I want something like Wagner" for
Star Wars, and the
Mad Max: Fury Road people saying, this is a motorcycle chase scene, so let's just use the music from the motorcycle chase scene in
Captain America and speed it up to fit our clip.
Avengers Theme (2012):
Contrast this with the themes from:
Narnia (2005)
or Pirates of the Caribbean (2003)
or EVEN Tsubasa Reservoir Chronicles (2005?)
The theme from Avengers gets your heartrate up and suggests epic fight scenes, I won't deny. It creates some level of anticipation (and also manages to incorporate leit-motifs from the individual Avengers). It's hardly a candidate for 'worst theme song ever'.
But...it lacks the emotional punch of many, many other great themes.