Family Matters started out as a rather ordinary Cosby Show-like sitcom about an everyday African American family living in suburban Chicago. But then something happened. Next door neighbor Steve Urkel was introduced. And just like that, ABC's TGIF line-up would never be the same.
I'll agree with most and say that the first six seasons were very funny. Classic episodes included Steve playing the role of Laura's husband for a school project, Carl teaching Steve how to drive, the introduction of Stefan, and the obligatory trip to Disneyland. Unfortunately, after Season Six (ie. when Steve finally moved in with the Winslows) it was pretty obvious the series was starting to wear thin. The writers seemed to be running out of ideas, often having to rely on Steve Urkel himself and his inventions for all the comedy, his cousin Myrtle was re-introduced for no reason, and even Steve's own character cooled down to the point where by the last season, he no longer seemed like the clumsy, nerdy Steve Urkel we all knew and loved.
Essentially, Family Matters was a very funny show for a while, but also one that should have stopped while it was still at its prime, rather than being forced to end after two or so seasons of lousy ratings.