Well, honestly, I think it coulda been miles better, specifically given the canvas he had to work on.
When people say it had an Indy or Star Wars trilogy vibe, I ask myself "Have they ever heard John Williams???"
Silvestri's music always brings one word to mind for me: generic.
There's no depth to his composing. Hell, there are better composers than Silvestri out there that do strictly trailer work instead of full-length features.
Out of all the MCU films, Thor & TIH had the best scores & still didn't leave much of an impact on me.
John Powell I think has been the best in the genre since it resurfaced through X-Men in 2000 (prior to that, Elfman takes the cake).
The score for X3 was simply marvelous. Larger than life, epic & dazzling. But that's John Powell for ya', and that's who Marvel Studios shoulda gone after for The Avengers.
Then again, he's gotten pretty pricey now coming off the Oscar nod.
Naturally, I love what Zimmer's done for the Nolan Batman films, but I wouldn't want him for Avengers. I love the man's music though.
Aside from Powell (which was ideal), I woulda gone after Eric Serra or Marc Streitenfeld.
With Silvestri, I'm expecting yet another forgettable score with truck-loads of generic themes.