Good on them for not rushing things.
So far the Avenger "tie ins" like Iron Man and Hulk (2008) have been awesome. Well cast and made by people who respect and understand the characters and stories.
Thor seems in good hands too and all that remains is finding the right people for Cap America.
If that means the Avengers movie is being pushed back a year to get the other movies comfortably in place before combining it all together. Avengers has the possibility to be THE blockbuster of 2012 if done right so i hope they do it right both storywise and characterwise.
And i just can't wait to see Cap yell "Avengers Assemble!
" (i'll be the guy who then yells "Hell Yeah!