I've heard similar complaints from a number of peopleI upgraded and had no problems [so far].
My only gripe is the new editor. It seems to be a case of foisting something on us that they think we need rather than there being a demand for it.
How do you like it?Having said that, I have been using Gutenberg since August and am sort of used to it now, but it is going to cause a lot of confusion. They really should have developed it as an optional plugin, rather than setting it as the default. I know they developed the "Classic Editor" plugin but that is doing things backways.