Come on man, you're better than this.
I'll totally agree there's no #1 WR, and that's a big problem.
Seriously though, Knox put up 960 yards last year in his 2nd season.
For comparison, Berrian put up 954 yards for the Bears in the year before he got his big contract with Minny, and 964 yards in his first year with Minny.
Give you another one. Vincent Jackson didn't put up 1000+ yards until his 4th season.
He's not a #1 WR, but he's absolutely an NFL caliber WR.