Warning: This review may contain spoilers When Jon Favreau brought us the first Iron Man movie, he may not have known the success he would bring on so many levels. He cemented his own reputation as a solid director. He brought Robert Downey, Jr. back into the spotlight as a go-to action actor. And he helped make Marvel and their characters blockbusters in their own right. Stan Lee should be a very proud Papa of all of his beloved franchises. After Joss Whedon did so well in tying in the Marvel movies that set up The Avengers, there really was some skepticism about whether or not each franchise on their own could continue the movie success starting with Iron Man 3. Without Favreau at…