I saw the movie. I liked it. Two reasons:
1) Good actors.
2) GREAT one liners.
The movie was, funny, and it went to great efforts to sublte try and convince adults (and comic buffs) not to take it too seriously. It was, in some ways, a spiritual successor to the Incredibles... with a little less heart and a lot more funny.
3) the movie downplayed it's weaknesses well...
Tim Allen is not an Oscar Actor, he's a TV Actor. He's also a cynical sarcastic middle aged man. Guess who his character is? Just that. It was a kids movie, and not a high budget one either... and so it flashed a little cartoony symbol to change scenes (60's Batman style) to deflect an comparing light kiddie fare to heavier, theme and empathy-laden Spider-Men 2 and Batmen Beginning. The kids took a lot from the FF, but remixed it so that it was basically LSH's Invisible Lad, Jean Grey, Molly from Runaways and some guy that turned super-fat and only in a cursory way an FF rip off.
I went, expecting to see a dumb kids movie and I laughed my butt off. Think of it like the generic brand Incredibles. "If you liked Incredibles you'll LOVE Zoom."
If you think EVERY superhero movie should be of the same style and quality of the Spider-Man Franchise or Titanic or something, stay away. You'll be miserable, and the laughter surrounding you will only infuriate you more.