As a QB coach, most folks here think that Brian Kelly could have done better, especially after Brandon Wimbush couldn't get over his case of the yips in 2017. However, after 2018, and the emergence of Ian Book, I doubt anyone here had any hard feelings about that.
As the offensive coordinator? A lot of us here were more reserved about that, preferring that someone with more experience step in, but since he had been around Brian Kelly for many years, I don't think you saw many folks who truly hated the decision.