Strongly disagree.
I felt the opposite. Season one is when the writers were still trying to fit it into the "Friends but in Chicago" mold. Season two is when they finally let loose and be its own thing. Season two had some of the best dialogue and writing I've seen in a sitcom.
If you had said all that about season three, I'd agree. Season three was when they started making bizarre storyline choices that went on for too long.
