Jeremy Denk has written a sympathetic and characteristically chatty review in the the New York Review of Books of Stephen Budiansky's new biography of Charles Ives, which I've read. I'm not sure who this Ransom Wilson is. I don't remember him from the book, he doesn't appear in the index, and it was the critic Tim Page, not Wilson, who, according to Budiansky, dismissed Ives as a "basement tinkerer" who knocked out "ditties" on Sundays (p. 15). (So, the Fourth Symphony and the Robert Browning Overture are "ditties." In thinking of those pieces, and so many more, the word never would have occurred to me.) I suppose Denk went back to the article in the New York Times Budiansky cites in his notes and found Wilson's name there. In any event, I have never heard of him, and I imagine Ives will be remembered and argued about long after he and Tim Page are forgotten.
I'm also puzzled by Denk's statement that "Ives's music often falls flat in performance." I have heard many performances of Ives that were far from flat -- among them Denk's own, with Soovin Kim, of the four violin sonatas. It was such a wonderful evening I recall it easily after seven years -- though I am still not sold on Jeremy's recording of the Concord Sonata.
I'm note sure, either, how high the Concord towers over Elliott Carter's Piano Sonata. My own feeling in comparing the two (since you asked) is that Carter, overall, is the more accomplished, but there are moments in Ives -- for example, "Hanover Square North" -- that take me places no other composer since Beethoven has ever taken me. (Jeremy also has an irritating habit, somewhat common among Ives partisans, of making the case for Ives's greatness while at the same time backhandedly slighting the music.)
I recommend anyone with an interest in Ives to read Budiansky's book. He's particularly good on the composer's health problems, and, mercifully, he avoids the imbroglio over the dating of Ives's compositions. (Maynard Solomon is never mentioned.) If I had a complaint, it would be that perhaps he spends too much time on the insurance industry and the treatment of diabetes. Biographers seem to feel obligated to put all their background research on the page. If it stands out more in this book than it might in some others, however, it does so because the book is so admirably concise.