Goff has been a top of the first round guy for months. He fits the classic Matt Ryan "maybe not Peyton Manning/Andrew Luck but just a cut below" mold.
Wentz is your Philip Rivers late riser, but the important distinction is that CONSENSUS has him moving from a 2nd-3rd rounder into the upper levels of the first round by draft day. Consensus has Wentz as at least a top 10-15 pick and if he ends up going top 5, no one will be really shocked, just like Philip Rivers.
You must contrast this late riser with guys who were consensus 2nd/3rd rounders on draft day who then had a team reach to select them in the first. 2011 is your classic example of this with both Jake Locker and Christian Ponder deminstrating why you don't reach for consensus 2nd day QBs in the first round. Other examples include JP Losman, Brandon Weeden, and EJ Manuel.
Thats not to say there are no QBs in Wentz/Goff's class who bust. Blaine Gabbert was thought of by many as a top 5 pick. On draft day he slid a little and he subsequently busted. He was an example of a guy who teams dissected and then said "maybe this guy doesn't belong top 5" and they were right. I have a subcategory of this class where I think the QBs were valid top 5-10 talents but fell for other reasons and then due to circumstances (not talent) they washed out of the NFL.... I'd place Byron Leftwich, Matt Leinart, Brady Quinn and Johnny Manziel in this category.
Finally you have the class for small school guys/raw-but-talented guys who never climb into the top 10 but still end up being good first round selections.... These players are considered raw or projects which costs them on draft day (whether it turns out to be true or not).... Ben Roethlisberger, Joe Flacco, Jay Cutler.... This is where Paxton Lynch will fit in. Busts occur in this category too, though, see: Kyle Boller and Josh Freeman.
Anyway, that is my QB draft prospect classification system. Wentz and Goff fit in the categories where I would select them. As I've said, they could still bust. Mark Sanchez was in the Matt Ryan category and he kinda busted. But being in that category means you don't hesitate to take him, in my book, if you need a QB.