I discovered Genesis with Genesis, Abacab and Duke, and for me,
that was Genesis for a long time. Not being much of a prog rock fan, I never really got into the older stuff, though I was obviously familiar with it. Last year however, I bought a Trick of the Tail on an impulse, and I actually quite like it. Maybe it'll be the gateway to the rest of the stuff.
As for Collins solo... His music remains associated with what they used to call "contemporary adult music", which was one of the biggest turn off imaginable as a label. And I always thought the label was appropriate in his case, even if I respect his accomplishments.