I like those too.
I see these clumsy movies based on cartoons that are often in name only and cobbled together out of old scripts for other films with a similar premise (oddly enough, George of the Jungle was, and it was one of the closest translations I've seen). But Rocky and Bullwinkle and Flintstones did the research. I mean, I dislike the fact the studio felt like they needed a female positive rolemode Mary Sue in the film to kill the comedic timing of Moose and Squirrel, but other than that the film's humor was exactly the same as the show... you had a Jay Ward historian play all the male cartoon leads, they got June back to play Rocky (nowadays, you need top notch A and B list people to do cartoon character voices of classic characters), and the humans that played the remaining toons? Can you say perfect cast? Jason Alexander has Boris's exact receding hair line.
You heard right. Same hair. They can't even cast people with same hair color half the time (since when is Penny Gadget a ginger? same time Dr. Claw always showed his face, I guess).
Flintstones... well, it's a little less well cast than the Moose (why is Betty fatter than Barney?) but it's excellent. The time and detail they put into making it look like The Flintstones? it just makes me very depressed that they've been foiled in every attempt to do a Jetsons movie.
I'd like to add two more to the list.
Popeye and Speed Racer. I can't believe Robert Altman gets flack from Popeye. That film was art! Generations have grown up with Popeye cartoons that were nothing more than Olive, Brutus, and Popeye chasing each other around until Popeye formulaically pulls out the spinach and pounds Brutus. Altman gave us the true Thimble Theater Popeye, complete with the Oyl family, Rough House, and the Geezil... perfectly cast (Shelly DuVall is Olive Oyl. I mean, REALLY... she was born for the role).
As for Speed Racer... come on. The original cartoon, while fun, was goofy. So we should expect the movie to not be goofy? Sure, it's a little long, and it was made when the Wachokowski (or whatever) Brothers lost it, but it looked like an anime and respected its Japanese roots more so than the original. And, hey... at least there weren't any mutants in there. And John Goodman as Pops Racer, referencing the fact he was a wrestler once (that happened in one episode)... they watched the cartoon. They knew the characters.