Yes HPMOR has been generally more believable, except for the one scene that matters in the whole book. At any rate, I am not sure if defeating Voldemort by use of an artefact - the Elder Wand is any less believable than using transfigured nanowires in secret against a much smarter version of Voldemort who forgets to use shields/wards/attention in order to catch harry this one time, and lets him have his wand when he doesn't need it.
the one scene that matters in the whole book
I wouldn't make that assumption. There are several chapters left and a bunch of things left unresolved, some of which seem like they could be important. Is he going to make further progress on defeating Death? Will we discover why there's a prophecy that he'll tear apart the stars, empty the skies, and end the world?
Maybe not; there might be nothing left now but wrap-up. But I don't think it's a foregone conclusion.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 114, and also, as a special case due to the exceptionally close posting times, chapter 115.
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)