Fans are often unrealistic and have expectations beyond common sense.
We have the best RB in the game, a 2nd round pick, one of the best QBs we used a 4th round pick on. One of the best Ss we used a 3rd round pick on (Hooker was a 4th round pick), one of the best WRs we used a 2nd, one of the best cover LBs, 5th round..... but hey, JRob sucks in the draft....
The other idiot button people hit is the expectation rookies should come in an dominate from day one. Nice when they do but also rare. Never mind Penei Sewell has Lion fans concerned about him... he has struggled. But Radunz is supposed to step in and make us forget about Conklin on day one?
And yes, some are just going to be duds or real slow to translate. It isn't so much Fitzpatrick simply sucks (now everyone is saying he was barely draftable) but he was a rookie competing with one of the best and deepest WR groups in the NFL. He was cut because there were simply too many guys better. Even Kinsey got cut and IMO that kid is similar to Humphries. Thus I don't excuse Fitzpatrick for not having it together more but guys like Johnson and Rogers played great. Batson freaked out in the last pre-season game to earn his spot. McMath being picked in the same draft didn't do Fitz any favors either.
Thing is Fitz was signed to the PS and quite possibly could make a jump going into next year and actually earn a roster spot. We shall see.