I never watched too often when it was on, but it certainly was popular enough to have seen a good portion of episodes over its run. Looking back, I probably would've appreciated it more as an adult since I was a teen when it was on and a lot of the humor didn't hit like it would today.
I will say that one line has stuck with me pretty much since I heard it in the episode "Reese Joins the Army: Part 2." It is a great Hal plot about being on trial, and he starts off his testimony by saying this line in response to his work performance...
"Marginal....at best."
The delivery is so dead on, I just started saying it to describe anything that was shitty. That alone makes the show a winner to me.