I think this is actually a somewhat solid season for its era.
Sex, Pies, and Idiot Scrapes: A-
Lost Verizon: B+
Double, Double, Boy in Trouble: B+
Treehouse of Horror XIX: B+
Dangerous Curves: B
Homer and Lisa Exchange Cross Words: B
Mypods and Boomsticks: B
The Burns and the Bees: B-
Lisa the Drama Queen: C+
Take My Life, Please: B-
How the Test Was Won: B-
No Loan Again, Naturally: A-
Gone Maggie Gone: A+
In the Name of the Grandfather: C
Wedding for Disaster: B
Eeny Teeny Maya Moe: B+
The Good, the Sad, and the Drugly: C+
Father Knows Worst: C
Waverly Hills 9-0-2-1-D'oh: B+
Four Great Women and a Manicure: C-
Coming to Homerica: B-
Sex, Pies, and Idiot Scrapes: A-
Lost Verizon: B+
Double, Double, Boy in Trouble: B+
Treehouse of Horror XIX: B+
Dangerous Curves: B
Homer and Lisa Exchange Cross Words: B
Mypods and Boomsticks: B
The Burns and the Bees: B-
Lisa the Drama Queen: C+
Take My Life, Please: B-
How the Test Was Won: B-
No Loan Again, Naturally: A-
Gone Maggie Gone: A+
In the Name of the Grandfather: C
Wedding for Disaster: B
Eeny Teeny Maya Moe: B+
The Good, the Sad, and the Drugly: C+
Father Knows Worst: C
Waverly Hills 9-0-2-1-D'oh: B+
Four Great Women and a Manicure: C-
Coming to Homerica: B-