"Recruit better" is a misnomer.
Walton, Irvin and Chatman, for example, were rated much higher than Burke, Stauskas, and Hardaway, respectively. But they haven't played nearly as well.
No staff is going to be right 100% of the time. I watched plenty of Walton's high school tape. He looked very capable of being a star point guard to me. And he was ranked in the 30-40 range, so obviously a lot of people getting paid to evaluate players thought so, too. Same with Irvin - he was ranked around 25-40. No reason to think he wouldn't be a really good player by his junior year.
The reality is, we don't necessarily need to recruit higher rated players, we need to be right more often about the guys we are recruiting - the way we were right about Morris, Hardaway, Burke, Stauskas, Robinson (rated #118 when he committed), Morgan, Spike, Levert - you get the point.
Essentially, it's not that our 2013 and 2014 classes were ranked really low compared to our other classes, it's that our "miss" rate on those guys was much greater, especially the top guys. I'd say all of Walton, Irvin, Donnal, Chatman, and Wilson have not performed up to expectations (yet).
With that said, both Robinson and Wagner appear to be really nice finds, and I think Simpson will prove to be, too. In fact, I think Simpson is more akin to Burke, and Winston more akin to Walton, in terms of both ranking and how good they will actually be in college.