Execution / Game

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Do you agree or not?

I don't. Poor stories with little character development yet excellent execution can only be called okay if looked at in an "objective" way. You might love them, which is totally fine, but you can't in good conscience compare them to good stories told well. This is the crux of style vs. substance.

Could it then be argued that the video game is the highest form of art, because making a good game requires mastery at all four of those mediums?

It could, if you consider quantity more important than quality. Even if you don't, each artistic medium provides a different experience. In music, the emphasis is on sound. In painting, the emphasis is on the visual. In novels the emphasis is on the written word. Film is not inherently superior because it combines these aspects - often many corners have to be cut to achieve the desired goal because film comes with its own set of limitations. As do video games. I think it's fallacious to assume that because video games engage more senses than other forms of art that it has more potential. It doesn't at all. I would liken it to some extent to the uncertainty principle. In order to get the results you want you have to let go of some aspects in favor of others, but you cannot do both to an equal degree. I would say that is what mastery over an artform actually is: embracing these shortcomings and finding how to bend the elements you have at your disposal to your will in spite of them.