Jenkins isn't setting the world on fire, but the SD game was not indicative of his abilities.
Its been more then just the San Diego game with Jenkins. He got burned in both of the first two games for big plays as well because he tried to read the QB's eyes & jump a route. Instead he's given huge plays to opposing offenses. Remember him trying to jump a route by Steve Smith & giving up a long pass because of it?
Both of Meachem's TD's were do to bad plays by Jenkins. On the first, Corey White was expecting Jenkins to cover his area of the field towards the inside & squeeze Meachem's route more. Jenkins was late squeezing the route & then turned completely the wrong way allowing a window for Rivers to drop the pass into.
One the second TD, Jenkins flat out jumped the route like he was expecting a quick slat or curl & left no safety help over the top for White who was expecting Jenkins to be in position.