I’m not sure there is a lot of security in highly rated Wide recievers. A great many are high strung egotistical ball hogs that cause almost as many problems as the rest of the team combined. Anymore you see the media pouring all over the teams that have problematic high dollar receivers. I think there are a lot of really good receivers that can be drafted in the 3rd or 4th rounds. To me the first and second round picks are outstanding lineman who are the team anchors and rarely cause problems with their egos.
There are great players available at every position in every round. QB is the one exception because there are so few good ones.
The top 5 WR's in the NFL by yards right now though are
Deandre Hopkins - First Round
Adam Thielen - Undrafted
Julio Jones - First Round
Michael Thomas - Second Round
Odell Beckham - First Round
You'll find that far more of the top WR's were taken highly in the draft than not.