So, you’re not wrong, it can get very formulaic. However, sometimes the predictability of the show makes it easy to watch, where you sit down, and think, “Okay, what are they gonna do TODAY?” In other words, how are they gonna make Phineas and Ferb’s invention disappear this time? Plus, the humor is what brings people in, in the first place; Doof has some really funny moments, and is pretty relatable. But honestly, it’s not the story that holds up; if you’re going for a good plot, by all means, Gravity Falls is TONS better.
Would ya look at that; two ImgFlippers had opposing opinions, and didn’t get into an argument like a$$holes. There’s gotta be a first time for everything, I suppose.