Loving eventually has a very strong cast, who carry the show through many regimes. I don't get the impression that was the case when Nixon and Marland were there though.
Marland's 86-87 ATWT is closer to what Long might have done. It is at times excellent, other times it feels very unnatural (the scene where Iva waves a pitchfork at Josh, Meg's fantasies, etc.). His writing from the strike on is much more contained and somber; I think it's the most refined version of what he struggled to put together up to that point (his GL work feels especially difficult to put together).