Same debate when they drafted Chris Rainey. Same argument rehashed. He is a weapon. Weapon. Speed kills. Big plays. Special teams. Yada, yada, yada.
Here is what it is. Is Archer a RB? If he is, only 1 RB weighing under 180 has been quasi-successful in the NFL in the last decade and that was Dexter McCluster and he had one good year with 114 carries for 516 yards and 1 TD. That is it. So, if you are selling him as a RB, sorry, not buying. The history and statistics show he will fail. Long odds.
So, is Archer a receiver? A slot receiver? If so, why not go with a guy that has been a WR consistently in college that understands routes, defenses, body control, how to attack the ball in the air, and all the other things that WRs have done in college while Archer too end arounds. He has a great vertical jump, does not use it as a receiver. Small catch radius. TINY hands, under 9". Miniscule. Short arms. Poor route runner. Does not block. As a receiver, there are probably 20+ players more NFL ready with NFL bodies.
Is Archer a specialist? Well, he does not return punts, putrid at it. Kick returner only.
So, a team that needs help/depth at NT, DE, OLB, CB, WR, and the OL decides it is wise to spend a top 100 pick on a kick returner. Let that roll around in your head a minute.