This was the show I was least looking forward to out of the ones I planned to watch, which is surprising, with my love of Alias, Lost, Alias, Fringe, and Alias. It just seemed kinda there to me.
That said...the pilot episode was pretty solid. It has the absolutely spot on characters, action, and humour that I've come to expect from anything J.J. Abrams does. His stuff always seems to have some of the best, well-defined characters out there, and this show is no exception.
But there's something missing. The show is really missing its hook. What sets THIS show apart from other spy shows? Sure, they're trained veterans, and in retirement, but that isn't THAT different. There's fortunately hints that there are other Big Plans afoot, but it was almost a throwaway line of dialogue. There's some huge potential here though, so fingers crossed.