My opinion that this isn't a weak QB class is largely because I think Watson is going to be a star. I agree with David Haugh that he's going to be one of the 5 best QBs to come out in the last decade.
Then I look at groups like (Goff, Wentz, Lynch, Hackenberg), (Winston, Mariota, Grayson, Manion), (Bortles, Manziel, Bridgewater, Carr), (Manuel, Geno Smith, Glennon, Barkley).
Watson, Trubisky, Mahomes and Kizer are just as talented a group as most of the past several years of top 4 QBs imo.
So I can't really agree that this is a notably weak QB class at all. It may turn out bad, it may turn out to have two HoFers. To me, the level of talent in this draft is actually pretty good. What it does have is young underclassmen from some various spread systems who probably need a year.
But I don't think talent and readiness are the same thing. The two most ready QBs in this draft are arguably Peterman and Kaaya. The top tier talent probably needs a year.