Oh, now that is just not fair! Marillion suffered the inevitable comparisons with Genesis when they were starting out, and to be fair, they deserved them, as Fish certainly did a mean Gabriel, but over the span of their career, and with the departure of Fish they've successfully ditched that tag and stigma, and become very much their own band, and their own sound.
Albums like "Marillion.com", "Brave" and the recent "Marbles" will show you just how different they are from Genesis, then or now.
Do I have to post a compilation?