Based on the ratings, "Martha Speaks" from 2008 seems to get better over time, with higher ratings in later seasons. A bingeable rating for the show would be 80.
Best Episodes
9.3
S8 E2
Martha and Skits/Martha Plays a Part
9.2
S8 E3
Martha Takes the Cake/Codename: Martha
9.2
S2 E12
Martha Plays Favorites/Martha and the Doggie Lover
Worst Episodes
6.4
S1E4
Martha Sings/TD Makes the Band
6.6
S1E7
Martha Ain't Nothin' But a Pound Dog
6.7
S8E8
Firedog Martha/Martha's Pickle
Best Episodes
9.3
S8 E2
Martha and Skits/Martha Plays a Part
9.2
S2 E12
Martha Plays Favorites/Martha and the Doggie Lover