True, as others have said, that at times the characters just aren't that true to life, but honestly how many sitcoms can you name where everyone's character was realistic? Some of the most well known classic popular sitcoms in TV have had unrealistic situations and characters; Mary Tyler Moore Show (Ted Baxter for example), WKRP in Cincinnati, I Love Lucy, and the list could go on for paragraphs.
There hasn't been an episode that I've seen of the Bill Engvall show that hasn't brought a lot of laughs. The acting is not Emmy worthy but the comedy is good.
I'll take the Bill Engvall show ANY DAY over the trash like Hannah Montana, Suite Life of Zack and Cody and the other similar shows that my kids watch.