I think the comments regarding the show being cheesy are a bit too exaggerated. When a person comes to watch a TV show, what does he look out for? It is to enjoy that he watches a show, unless he/she is a critic or a person who analyzes story. But most of us are not so and watch the shows to relax and enjoy. FULL HOUSE is an ideal show to watch after having a heavy day in the office/school. It makes you laugh and it is not just humor.
Yes, the Tanner family is a perfect family, a perfectly hypothetical family. If any such family existed in real world, it would be a role model for us to follow. But this is a TV show, and not a real family, and there is nothing wrong in depicting a hypothetical family on television. The very fact that the show could run so long shows us that people enjoyed watching it, whatever be the comments later on.
Another good point about the show is that any person of any age would not only enjoy watching it, but would take back a message however childish that message be. Those Jesse's talks with Michelle are extremely touching, if one doesn't think of it as childish.
Overall I would say after watching every show of Full House, there is a contentment in your heart that is rarely present after many other shows.