I hope we are able to equally agree this sentence is Mistaken simply because "very good" is undoubtedly an adjective, and cannot be the subject of "is". The same is legitimate if you place "the best" in that location. It's easy to argue that "the best" could be correct as https://connerxsvkv.blogdanica.com/38287847/how-much-you-need-to-expect-you-ll-pay-for-a-good-affordable-lawyer-in-dha-karachi