I covered Doc's Nebraska teams for a few years. First off, when Chris or someone else says you can't recruit to or win at Nebraska, that is absolutely true (or it was, anyway; they're opening a sparkling new arena next season and have a new practice facility, so the children of the corn are finally putting some of their football $$$ into hoops). When Doc was there, they played in the worst arena in the Big XII by far, and if it wasn't automatically the worst in the Big 10 when they moved, it was close. Nebraska also has zero hoops history; they have never won an NCAA Tournament game, and their two most notable NBA players are probably Tyron Lue and Eric Piatkowski. It was a complete no-win situation. On top of that, Sadler got the job in the August of his first year when Barry Collier abruptly jumped ship to become the AD at Butler, so Doc had no momentum going into year one at all.
I can't speak directly to his recruiting ability, other than to say he knew Nebraska had no shot at any kind of blue-chip players or even players a level below that, so he was always looking for the overlooked guys. Nebraska was kind of a home for big white guys from Europe, for example. I do know that, despite his appearance, Doc is an impressive guy to talk to one-on-one. He's energetic and relentlessly positive. Does that translate well into talking to recruits? I'm not smart enough to answer that, but I think Sadler would fare a lot better in living rooms with a Cyclone logo on his shirt and Hoiberg's name on his lips, than he did trying to sell kids on playing basketball in a state that only cares about football.
I can't say Doc Sadler is the best choice. There's so many potential candidates for an assistant coach job; most, we don't know anything about. When we do know something about an assistant, it's probably because he's someone like Sadler, someone who's warts we know all about because he's failed somewhere else as a head coach. I know Bill Self made him an ops guy and not an assistant coach at KU, but I always thought it said something that Self moved pretty quickly to pick up Doc after NU let him go.
So far, Hoiberg's been pretty good at making decisions. If he thinks Doc is the guy to keep ISU basketball moving in the right direction, I'm inclined to trust that call. Like many have said on here, though, it'll be a while before Fred makes that decision. I'm fine with that, since I don't think (correct me if I'm wrong, please) the next recruiting period begins until July anyway.