The first play of this reel showcases the value of Watson's long reach. Even when speed rushers get a step on him, he's able to lock in and leverage them past the pocket. He does it a few more times in this video package, including in a replay that starts at about 00:45.
That's an incredibly important skill in combating the relentless outside rushes of NFL defensive ends.
Unfortunately, plays like the one at 6:00 demonstrate exactly how raw Watson is. His footwork is inconsistent and his pad level is often too high. On this play, his hand placement is also too wide, allowing the rusher to get leverage on his chest. Watson essentially gets rag-dolled and has to be bailed out by an EJ Manuel scramble.
These kinds of issues make Watson a bit of a gamble in the first round. He's a talented prospect with excellent mobility, but his technique is raw and he turns 25 in December.
Still, his upside as a zone blocker with pulling skills and second-level quickness make him a borderline first-round pick.