When people complain about Tolkien’s lack of writing chops, it merely reveals their lack of historical knowledge of what tradition Tolkien was drawing from and what he was attempting to achieve.
He was of course writing in the tradition of epic mythology – specifically Northern European mythology – and following many of the writing conventions and styles of that genre in his most-known work, The Lord of the Rings.
Wagner’s also-turgid and epic Der Ring des Nibelungen flows from the same source, though is considered a classic in most circles because of its genre and that the composer is longer-dead than Tolkien.
If you read translated works of Old English, Norse, German and Finnish mythology, unsurprisingly they sound and read just like LOTR.
It’s not really that Tolkien’s writing was bad, then, but that as an academic he made the mistake of accidentally writing a popular work. And even worse, it had magic and elves in it.
In nearly any field, there are few worse crimes than exceeding your peers. In academia it seems a particularly high crime for some reason, and there were few guiltier of that particular infraction than Tolkien.
And for that he has never been and never will be forgiven.