The thing with Woody Allen is that he's the last of the genuine film-makers, i.e. people who just love making films. He writes & directs a film every single year without fail, so even if you don't like this one, at least you know there will be another one along soon, unlike most directors these days, taking 3 or 4 years between movies... his next movie, the London-set "You Will Meet A Tall Dark Stranger" (with Anthony Hopkins, Antonio Banderas, Josh Brolin & Naomi Watts) has already premiered in Cannes (to "muted" reception), and the one after that, "Midnight In Paris" (with Adrien Brody, Owen Wilson, Michael Sheen & Kathy Bates) is about to start shooting.
Woody apparently always has 5 or 6 scripts in varying states of completion, and when it's time to make a new one he picks the one that's either most finished, or best for the availability of certain cast members, or simply the one he fancies most at the time. WW was a 70's script he wrote for Zero Mostel that he brought out of mothballs when Larry David expressed interest in working with him. I was disappointed in it myself, but to read some of the reviews you'd think Woody had personally insulted the critics in question...