Sure, some of his characters may be a bit flakey and some of his stories 'too drawn out', but the man's genius lies only partly there. His ability to pluck words out of thin air to create his narrative (the man invented 1700 new words!) and give them directly to the people influenced the English language in a way that very few, or indeed any, individual people have done before. He is a wordsmith in a very literal sense.
While his comedy night not translate well to other countries or cultures, and some is lost in time, a lot of it is incredibly astute and still very very funny today. He also had a huge influence on the now-classic farce, something that has moved from the stage to the screen still carrying his marks.
My mother has seen every single play performed live, so I was taken to quite a few when I was younger and developed a taste for him. The man was a genius.