The weaknesses of Whitney lie in the other characters. Had the show stuck to just the central couple, it may have proved more popular. Instead, likely to keep with an accepted formula, four other people are shoved into the stories. It's not that the actors are bad, but they don't quite fit the way that they are inserted.
Early on, none of them are interesting. By the middle of the season, each becomes better defined, and starts landing consistent laughs. By "Something Black, Something, Blue," though, they land somewhere in between the high and the low points.
The issue is that once the writers figure out what to do with the other four, and capture them wonderfully, there isn't a lot of wiggle room for situation comedy, based on who these people are. They are developed in a kind of narrow way. So forcing Neal (Maulik Pancholy) to suddenly be gay, and then to have Lily (Zoe Lister Jones) enjoy a kiss with Mark (Dan O'Brien), who is interested in Roxanne (Rhea Seehorn), seems desperate and gimmicky. It gets them out of the box that they are written into, but not in a way that feels natural. Had Neal and Lily taken their walk down the aisle, perhaps they would have been boring, but at least they would have stayed true to the characters presented.
That being said, season two could still be good. Perhaps Lily and Mark might work as a couple, if they are given a chance. Neal could become a fun gay character, once the awkwardness of his out-of-nowhere coming out wears off. Roxanne is actually fine the way she is now. And, of course, more tales of Whitney and Alex will always be welcome.
The only bright spot to a cancellation, and I do mean only, is if Pancholy returns to 30 Rock, where he has been missed.
Whitney airs (aired?) on NBC.