In the late 50's, Gene Deitch was brought to Terrytoons to help develop new stars. Deitch decided that it was past time that Terrytoons began creating human characters to complement, though in this case they would replace, classic characters like Heckle & Jeckle and Mighty Mouse.
Unfortunately, John Doormat was not the answer.
Doormat appeared in 4 shorts total between 1956-9, but the animation was much more limited than usual, lacking the fluidity of earlier works. It didn't help that Doormat wasn't really a likeable character. As demonstrated in 1957's "Topsy TV", Doormat is, to use modern parlance, whipped. His wife treats him like a child, seeing that John comes home from work soooooooooo tired. You take a look at the scene where John gets off the bus, and you'd swear this wasn't Terrytoons, but rather a Famous Studios entry from the same period.
I think I can see why these shorts have rarely aired on television.