Some data. The players I'm referring to are all players who at one point in their career started at least 9 games in a season, and were drafted since the return of the Browns in 1999.
First, it is clear that in recent years, teams have been more willing to play rookie quarterbacks, and that generally speaking rookie quarterbacks are performing better now than in the earlier part of this study timeframe. This chart shows that in the past, the total number of passing yards in rookie seasons was generally much lower and the trend is toward first year QBs throwing for many, many more yards.
This is not only a function of a more pass-happy league; rookies are starting far more games - a trend that really kicked in around 2008:
This fascinates me as it theoretically flies in the face of the thought that the proliferation of spread offenses means that quarterbacks need MORE time to learn the NFL rather than less.
Earlier in this thread I pointed out that you have to go "all the way back" to Aaron Rodgers in 2005 to find a truly successful quarterback who did not start at least 10 games as a rookie. From 1999 to 2006, 8 quarterbacks started a majority of their teams' games as rookies. The only one to pan out was Fat Face himself, Ben Roethlisberger. Meanwhile, Rodgers, Rivers, Eli Manning, Palmer, Brees, Brady, McNabb and Culpepper all had great success after NOT playing significant time as rookies. Again, since that time there has been only 1 major success story of a quarterback who did not start at least 10 games in his rookie season (Kirk Cousins).
99-06: 8 rookie quarterbacks started.
09-16: 23 rookie quarterbacks started.
My question earlier today was what kind of season would we want to see Kizer have in order to feel comfortable with him enough going forward that we would not use significant capital to draft a quarterback next season?
Here are the top 20 rookie seasons since 1999, by Pro-Football-Reference.com's "Adjusted Value" statistic. The "VAL" column on the left is my secret sauce metric for overall player value over the player's career. It's not perfect, but it will give you an idea at a glance at who's good and who's not.
What I see here is that the among the top 10 rookie seasons, there's only RGIII who ended up being a bust, and that could largely be attributed to injury. Of course there's Prescott and Winston who don't have much career behind them as well, but their respective teams certainly aren't considering a first round QB in the upcoming draft.
I honed in on the top 10 because looking at the guys below the top 10 on the list, I saw a lot of guys I would feel pretty shaky hitching my wagon to, with the exception of Marcus Mariota. Ironically, the bottom 3 of the top 10 on that list just happen to be the other AFC North quarterbacks:
Ben Roethlisberger,
Andy Dalton, and
Joe Flacco. A closer look:
Note how the Steelers protected Roethlisberger, as he had the fewest pass attempts of any one (even prorated over 16 games he'd have thrown only 350-360 attempts.
In any case, I think these are the kind of numbers I want to see from Kizer to pass on quarterbacks next season. Here are these 3 guys' stat lines averaged out, over 16 starts:
278/452 for 60.7% completion percentage. 3121 yards, 18 TD, 13 INT.
A QBR over 55 would be nice. QB Rating is kind of a joke but below 75 would be a major red flag as the only rookie starter who posted a number worse than that who ended up being a quote unquote Franchise Quarterback was Donovan McNabb.
Stafford, Mariota, Bridgewater and Carr are the only "good" quarterbacks that had worse rookie years as starters. 3 of those guys are still young and we're waiting to see how they really pan out. As for Stafford he had a hideous TD/INT and piss-poor completion%, and yet he turned out alright. Again, if his numbers don't match up with what I've outlined above, I'm in the QB market again next year and taking another spin at the wheel.
Full spreadsheet here:
https://docs.google.com/spreadsheets/d/1bl7v0R5a5c0j2SYZC6j9yjq92Zpl1s0TOimCwGGihds/edit?usp=sharing