Delores O'Riordan definitely chose a perfect time to disband this band. Although their legacy is an amazing one, had they gone on, they may have had to stoop to something very "pop-sounding", and that wouldn't be good.
The Cranberries greatest hits are defintely their greatest. To say they went out on top is not exactly accurate, but to say they went out at their peak is.
The Berries best songs came from "No Need To Argue," which is also their best album. This is proven by the fan-picked, non-single, "Daffodil Lament." I personally would have picked "Forever Yellow Skies" from "Faithful Departed", but this is a classic song anyway. "Zombie" was an incredibly good song, and I'm glad they didn't edit it, unlike "Promises", which IS edited on this compliation.
Bottom line, if you like all the songs on this cd, I suggest going out and buying their previous albums as well...it'll definitely give you an idea of what their legacy is all about!