I think I see your problem
-- you choose your superhero movies poorly!!
I did start to feel like the ending was a little like the ending of the last LOTR movie -- where it had 5-6 epilogues.... this one sort of needed it though.
Also --
I wish someone would give Favreau a bit more credit. If Iron Man doesn't hit hard -- the rest doesn't happen......or at least not to this extent. The dude went from being Vince Vaughn's sidekick to being one heck of a great Director!
Also -- there is no after credits scene -- so, no need to wait through the 20 minute credits....