If we're talking about greatness, sure. That tends to be far more objective. I'm simply talking about quality. It's pretty easy to say whether or not something is quality. At least I tend to think so. There are lots of things I don't like for various reasons, but I can still say with confidence that many of them are quality products.
I sort of see "greatness" and "quality" the same way.
Now, I agree that you can measure certain things scientifically. Digital Foundry makes a living based on that.
But apart from frame rate and textures and lighting effects, can can you made a convincing case for objective video game quality? Some people like easy games; some prefer difficult ones. Online multiplayer is essential for many reviewers; for others its an afterthought. Complex menus and button inputs are off-putting for some, and immersive for others. Gameplay, by its definition, is a very personal, subjective thing -- it's how we as players interact with the rules of the game.