The only issues I have (currently, until proven wrong) with DIscovery with the Spore Drive and other technological things, is that it didn’t seem to have an answer for why the Federation didn’t use it later. I do know that in the timeskip season, a log does not mention the use of the s-drive.
But man I can only imagine how pissed Admiral Janeway would have been to find out it exists.
Plus I can’t hate a show that has Doug Jones in it. I didn’t get into Discovery, but I don’t hate it.