The Ups: Embraces it's superhero origins and becomes an entertaining superhero team-up full of action and great character dialogue. Hulk gets a redemption and Scarlett Johansson has a more active role and totally overshadow Catwoman from that other superhero movie.
The Downs: How is they going to top this? "
"“Shakespeare in The Park? Doth mother know you weareth her drapes?”- Tony Stark/Iron Man (Robert Downey, Jr.)
“He's adopted.”- Thor (Chris Hemsworth)
“Hulk? Smash.”- Steve Rogers/Captain America (Chris Evans)
“That's my secret Cap: I'm always angry.”- Hulk (Mark Ruffalo)
“Puny God.”- Hulk (Mark Ruffalo)