if you want a tier 2 WR, yeah you should. A better bet would be to draft the CB and move up in RD2 for the WR.
I have zero issues with locking down the back end of our Defense, this is not my preference, but if you are not inclined to move up to secure elite talent, then you ride the BPA train and these CBs actually look damn good! Saftey could also be a pick here, especially if you plan to let Poyer walk.