This is all second hand info, but a friend of mine is a Nebraska football enthusiast [originally from Nebraska]. I see him at our daughter's soccer practices every week. We chatted about Tony White going there, the transfer Safety from Nebraska coming here, etc. He follows their team / recruiting as closely as we follow SU's, so he is knowledgeable about their program.
Last week I talked to him about Fisher. His take was that their fanbase was really upset about him leaving. That they understood that Rhule as a new coach coming in obviously wants to bring their own coaches with them, but apparently Fisher was VERY well liked by their fans.
Sounds like they've also put some DBs in the pros recently, and he's considered a strong recruiter. He's fairly young, and the recruits / players listen to him, because of his NFL pedigree.
He apparently came in and told the DB room: "I'm here to recruit your replacements. And it's your job to ensure that when they get here, you don't lose your job." Sounds like they had fierce competition for PT, that their DBs tackle well, and that he coaxed the most out of them. They had a big recruit from a couple of years ago who hadn't lived up to the five-star pedigree, then Fisher came in and turned the kid into a coveted draft prospect at Safety [think he's going pro this year].
So not much to go on -- but it sounds like the Nebraska fanbase thought favorably of him, which is a good sign.