Yeah, it doesn't hit its stride until the second season.
But I think that's most sitcoms. Even the best ones - Seinfeld, The Office, 30 Rock - had awkward and unfavorably received first seasons.
For reference, here are the Rotten Tomato scores from Season 1 to Season 2 of those shows:
Seinfeld - 72% --> 100%
The Office - 82% --> 100%
30 Rock - 75% --> 90%
Parks&Rec - 67% --> 88%
Schitt's Creek - 61% --> 100%
Only good sitcom that comes to mind that is good in its first season is Community, which opened with 90% in its first season before getting up to 100% in its second season.