Couple thoughts...
Barner: Don't see anything to get really excited about. IMO, nothing he does translates to the NFL very well. Great college player, but the kind that will struggle in the NFL. Just my opinion, and definitely not saying anybody is "wrong" about him, as none of us are GMs.
DAT: Really exciting player and quite honestly I see him as a Poor Man's Percy Harvin. Harvin is bigger, stronger, and has similar speed & start/stop ability. Harvin is a more natural WR as well. I don't see a 1st rounder when I watch DAT, strictly because he is so small and doesn't have a true position. Tavon Austin is a smaller guy, but he's built really well and is a true WR. I think DAT has a place in the NFL, but he needs a special OC to tailor plays to him. That's a really big thing to ask for a 1st rounder.
Again, just my opinions, but I see these guys in the same light as Pat White, Steve Slaton, etc...great college players who fit a specific scheme, but are not guys who can really last in the NFL game. Now, I know the NFL game is adapting college concepts, but NFL players are still big, strong, fast, and physical. We saw in the playoffs, that big, physical teams are still "in."