Smart, well-written show that adults enjoy as much as kids
Phineas & Ferb is a bright spot in children's entertainment programming today. The writing is smart, with plenty of knowing winks to adults along the way to keep interest way up; I don't know who likes it more, me or my children! Any kid's show that can make a running gag of the phrase "I hear there's a new version of Jane Eyre in the offing" gets my undying love.
That said, I need to issue a correction re: CaptFantasy's review. During the Mary McGuffin episode, Doofenshmirtz calls the maker of the (supposedly) upside-down On-Off switch a "Dummkopf"--German for "dumb-head" (or, simply, "dummy"). The joke is that HE is the one who has mounted the switch upside down, and that realization dawns on him even as he is saying the words. Please do not blame the writers or warn parents against something merely because you failed to understand it. Thankfully, the writers never went anywhere near Adam Corolla's neologism.
Summary: smart writing, clever literary/high art/pop culture references, great chuckle-inducing multi-culti representations (Mrs. Garcia-Shapiro at the Mexican-Jewish cultural festival, anyone?), gentle satire. Phineas & Ferb is a rare treat.
What other families should know