I have to agree with almost everyone here, to me, the 90's were Elton's weakest decade. However, I do agree with Zoots about one thing - the song The One is absolutely gorgeous, haunting, etc. It's one of my favourites by him. His Disney output (that's pretty much the way I lump the whole decade of his 90's material) is resoundingly meh to me. When you look at the 90's for him, it was mostly soundtracks and a duets album for him. I suppose if that's your thing, that's fine, but it was a little too adult contemporary for my liking. But, he must have seen some artistic value in doing the work, and I can certainly see why others would enjoy it. He has some really solid material in the 80's, too, with Empty Garden (Hey Hey Johnny), I Guess That's Why They Call it the Blues and I'm Still Standing among them. As others have noted, in the 2000's he returned to something closer to his 70's singer - songwriter form with Songs From the West Coast, Peachtree Road, and The Captain and The Kid.
Bottom line: it's Elton Fucking John. No matter which decade you listen to, you really can't go wrong.