This song is about a failing relationship. The singer feels that no matter how hard he tries, the relationship keeps ending up in the rut: "It's always the same, it's just a shame, and that's all." http://www.songfacts.com/detail.php?id=5822
Not only did they move from prog rock group to superstar hit makers, they didn't really drop the prog, just pushed it down a bit. All albums from Then There Were Three on had long instrumentals that were tight prog. The Brazillian, Duke's Travels, etc.
I understand that folks might like the PG version of Genesis better. I think they are really separate bands to be judged on their own merit. And I like PG's solo career better than his Genesis work, and Genesis better without him. Sometimes divorce works for all parties.
I always liked this track. The one thing I've always admired about Phil Collins is how he was able to transform one of the greatest progressive rock bands into a successful commercial pop band when Peter Gabriel left to pursue his solo career.