This show was doomed from the start. The writers could have at least taken a look at real teacher life before writing this show. Some of the stuff are just implausible (drinking in school, golf, a substitute becoming a full-on teacher "just like that") and ridiculous beyond humor. All of the characters are poorly drawn (why is there a random British teacher?) and the main character has a huge foible: most of the time he is ridiculous and immature beyond reason, but we are supposed to believe that he has his "serious" moments. For the main character in Scrubs, I can believe it, but this show just won't Sitwell with you. It sure didn't with me.
They made a huge mistake.