+1 Loved the early stuff, and like the Gabriel solo work even more (that live 'Secret World' CD/DVD is just mind blowing).
Later Genesis... YUCK!
+1 to Hoover's post 7 also....
And a + 1 to most of that.
I'm another of those people who was an unashamed Genesis fanboy. I saw them for the first time in 1972 when I was 17. They were supporting a folky/rock band called Lindisfarne (who were the band I'd actually gone to see) at Bedford Corn Exchange, but from the moment the band started "Watcher of the skies" - in complete darkness apart from a UV light picking out Gabriel's eyes and batwings, I was hooked.
I was also hooked on Rutherford's Rickenbacker, I already had a passion for Rics from watching Chris Squire, but Mike Rutherford sealed it for me.
I saw Genesis a further 12 times live, the final time on 'The Lamb Lies Down' tour and religiously bought all their albums on the first day of release.
Genesis needed Gabriel. He bought a dark humour and a sense of menace to the band's material and that carried through to his solo stuff which (with the lamentable exceptions of Animal Nation and The Barry Williams Show) remains edgier to this day than the sacharrin that Genesis veered towards (even on Trick of the Tail did 'Squonk' really work either as myth, the stuff of legend or even humour? Not in my book, pretty lame IMHO)
Like others, I disagree that Rutherford is merely adequate as a bass player. He seems to structure his basslines to harmonise with the vocals or act as countepoint rather than follow the chord structure - it ain't roots fifths and pentatonics. It ends up being very unpredictable and quirky - ever really tried nailing the bassline to "Get 'em out by Friday" - I did a long time ago and found it deceptively easy (that is, it sounded easy but was harder than it sounded).
I've grown away from Genesis in the last 30 years. They were fabulous in their day, even iconic and awe inspiring, but times change and I find I've outgrown the stuff I used to be in awe of (although I'm still fond of it in a nostalgic kind of way). For my money, the big blockbuster songs that everybody seems to centre on (like Suppers Ready, Cinema Show or pretty much all of LLDOB) are all fine, but to me the one track that pretty much defines Gabriel era Genesis with lyrics drawn from legend, chiming acoustic guitars, sweeping Mellotron, Hammond organ, bass pedals, quirky Hackett solo and equally quirky bassline is...."Can Utility and the Coastliners"