I'm getting really tired of that r-word being thrown around so much.
I was NEVER a FF fan growing up and was indifferent to the cartoon and comics. Back in 2005, I was put off by the bad reviews and dragged to see the film with my family. Guess what! I ended up really enjoying it and it got me interested in the comics. I still enjoy watching it when it's on, and find immensely fun and entertaining. It's not a dark, brooding masterpiece, and it was never meant to be. And honestly, what would you rather watch when nothing else is on and you want to have a good time: FF or something like Superman Returns (which I still like)?
From what I've read in the comics, the tone is pretty faithful to the source material, too. Some comics might just not be meant to be gigantic, smash-hit films. Look how many times The Punisher and Hulk were rebooted. All versions were unique and faithful to the comics in their own way, but only ended up making little more money than the previous versions.
The market is so over-saturated with genre films (not that I'm complaining) that I HIGHLY doubt a new FF film is gonna be a significant leap in quality over the previous two and make that much more at the BO, to boot. IMO, they should just take what worked from the first two and try their best to give it a good screenplay.