Among the Queen songs I hold the dearest, most of them were written by May, so there's my bias. π
Apart from "Mr. Bad Guy" I also have "Back to the Light" by May and "Happiness?" by Taylor and I've listened to them a lot. Of these, May's album is the one that sounds like a Queen album missing 75% of Queen.
May is not as good as Queen, they all needed each other to be at their best, but the production level on that album is Queen level, and I think that's a fairly unbiased opinion.
My suspicion is that both Mercury and Taylor had too much of a say on their albums and May might have been less of a strong-willed auteur and more of a musician working with a studio team when making his.