The Avengers impressed critics, fans and the box office - making more than $1 billion worldwide. How do you begin to even follow that up on TV? Well, for one you keep The Avengers' director, and huge TV veteran, Joss Whedon involved.
Agents of S.H.I.E.L.D. takes place in the Marvel universe of course, and takes place after the events of The Avengers. Agent Phil Coulson, played by Clark Gregg, is back, even though he was killed (or was he?) in The Avengers. I'm sure there'll be a great explanation for Coulson's return, with all of the technology at play in the Marvel universe, I'm sure they could bring him back easily.