It definitely didn't suck, in fact, the design was probably great. The ground had sandy soil with links turf and some decent elevations, and done on the heels of Lido. Shinnecock's current and excellent 7th and 9th holes would have been an indication. (Those are the two I know of...any others?) Alas, t
he CBM course was not long for this world. Bret, please correct me, but I think it only existed from about 1916 to 1930 with the WWI years cutting into its already short lifespan. Yes, they inherited the original 1891 course which had to come with limitations. Probably what happened, after the war, its proximity to Route 27 became a liability. It likely became untenable to have a considerable portion of the holes in the way or adjacent to a new and increasingly-busy road, and they had wonderful ground away from 27 in which to expand. By 1930, Raynor was dead and Macdonald had been retired for about five years and he must not have been interested in revising his own work, even if he lived down the street for much of the year. Perhaps he signed off on the design. It's a shame this was a few years after Scotland's Gift, otherwise we may have had some commentary on it. CBM may also have seen the benefit of having a course contrast with NGLA (and Southampton GC) and not have 54 contiguous holes in his style.
Here's the original scorecard (with terrific holes names!).
https://photos.app.goo.gl/Txb7JyGiNJztUM8S6I don't think it is a reach to speculate, if it was completely in tact today, that it might be a peer to (and maybe ranked as high as) Garden City or Chicago Golf. Like its clubhouse, it was definitely better than 98% or 99% of new courses built since WWII--and maybe
everything from the 1940s, 50s, 60s, 70s and 80s!