Surprised Boy Meets World is leading this, but that was a great show. Figured it would be Family Matters, Full House, or Step by Step before I voted.
Mr. Belvedere is underrated. It was the first ripoff of Who's the Boss? that became a huge hit. The second was The Nanny.
People forget Perfect Strangers was really the first breakout sensation that turned TGIF into a thing. Balki became a household name like Sheldon Cooper from Big Bang Theory. I know the latter isn't viewed favorably around here, but I'm just imparting that's how big that character was. He was simply huge. He was so big the actor couldn't overcome the typecasting.