No doubt the slavery stuff - specifically Daffy Duck acting like a Stepin Fetchit-style character - might make us cringe at "Wise Quackers" some. But as long as we understand what it's portraying, it's really funny, with filmdom's most famous member of the biological family Anatidae* falling onto Elmer Fudd's farm and begging to be his slave rather than get killed. Of course, this is an excuse for him to turn Elmer's lifestyle upside down. Probably the coolest scene is when Daffy warns Elmer that the food might be poisoned and so the slave should taste it first; although I guessed what Daffy was going to do, I didn't predict that they would play Franz Liszt's "2nd Hungarian Rhapsody" to accompany it! Of course, the Looney Tunes cartoons used that song quite often, so it's no surprise.
Anyway, a pretty funny cartoon, despite the slavery stuff.
*That's the family to which ducks belong.