Sad but true. Too many beautifully rendered games that aren't terribly engaging because amazing graphics are what the mainstream market demands. (I've avoided buying the latest gen consoles partly because of this, but mostly because I just don't get the time to play games that much these days.)
That being said there are also many beautiful games that are amazingly fun, and the graphics do add to the experience, but they're more like the icing on the cake. That's not quite the metaphor I'm groping for, but you get the idea: the gameplay is a fundamental that has to be right, and then the graphics can really add something; without the gameplay the experience is always destined to be flat.