Considering they had David Kohan & Max Mutchnick (Will & Grace) as executive producers; James Burrows directing an episode and Judith Light's great comedic abilities, I was surprised this show wasn't stronger.
I recently watched all the episodes on aol.video and actually laughed out loud quite a few times.
I think the major problem was the lack of chemistry between Robert Klein and the other actors. Judith Light's, Jay Baruchel's and Lindsay Sloane's characters all interacted very smoothly. Klein's character never quite seemed fit in.
I know everyone was probably expecting the same chemistry that Judith Light had with Tony Danza, but I'm sure there was someone else in Hollywood that was available and would have been a much better choice than Robert Klein.
There was one scene during the episode where Barbara's (Light) parents come to visit where Judith Light adeptly proved that she'll go to great lengths to get the laugh. Stan (Klein) takes a big puff on a huge cigar and promptly kisses Barbara. When Barbara finally wriggles free, she turns to the camera and the cigar smoke now comes out of her mouth. It was great.
Perhaps if CBS would have devoted more air time to this show it could have been tweeked and vastly improved. After all, Raymond wasn't that great it's first year either, then went on to have a nine year run.