I read it some when I was young, but had trouble following it. Plus, I suppose I wasn't intelligent enough or sophisticated enough to appreciate the politics Kelly injected into the strip. Even today, I think Pogo would have been better had it stuck to the foibles of life and personalities because injecting politics upsets or angers a good deal of one's potential audience.
That aside, Kelly's cartooning style was marvelously inventive. I show some examples below that I grabbed off the Web so that readers unfamiliar with Pogo can see what I mean. For instance, note Kelly's use of a variety of typescripts in the second image. Also observe the outlines of the panel boxes; hand-drawn and bold. Most of all, consider Kelly's combination of strong brushwork and body action for his subjects -- this probably thanks to his days working for Walt Disney.