Geno's career TD/INT ratio is 34/37. You can't rationalize that bad of a ratio as being the result of no 'weapons' or the offense he was playing in.
Actually I would because Geno as a rookie with the Jets were a run oriented offense that generated 2158 yards on the ground (Geno contributed 366) that lacked weapons at the WR position. WR Jeremey Kerley (who?) had 43 receptions that year as the leading receiver on the team. RB B. Powell comes in at 36 receptions in second place for that squad. WR David Nelson with 36 receptions and then TE K. Winslow Jr. with 31 receptions. TE Cumberland with 26 receptions followed by old man WR S. Holmes with 23 receptions...I think people can understand where I am going with this.
The following season (2014) the Jets had finally landed a legit WR talent in Decker and Decker generated 76 receptions in 15 games. Geno had 13 TDs and 13 INTs in his second season which is actually a 1:1 ratio which is very mediocre average but a sign of progress from his rookie year and it is rare for a rookie QB to have a 1:1 or better TD/INT ratio at the NFL level.
Anyways, after Decker the next best weapon was...you guessed it Jeremy Kerley (who?) at 38 receptions. Followed by TE J. Amaro (only played two seasons) with 38 receptions and then WR Percy Harvin with 29 receptions.
So in summary Geno was trending toward average QB play but it could be argued he helped his teammates be drafted higher than they were from WVU. Maybe Geno was assisted by weak collegiate defenses and T. Austin and Bailey being simply superior than inferior collegiate defenders and maybe Geno was over drafted.
Regardless what I do know for sure is that when you put actually weapons around Geno is that he can deliver the ball to them.
To put this in perspective...F. Swain had 25 receptions as a 2nd year player while Locket and Metcalf both had 70+ receptions. Dissly has averaged 20+ receptions the last three years. Fant has averaged 60+ receptions the last two years.
Geno is walking into a more talented squad at starting spots and depth at WR/TE. Not even close. Don't be surprised if Geno or Lock do better than anyone thinks IMVHO.