At the time of appointment, Coetzee was the only SOUTH AFRICAN coach who looked qualified to take the job, with the exception of Ackermann (who was my preference, although he hadn't yet had his 2016 Super 18 runner-up season.)
The Stormers made the Super Rugby final in Coetzee's first year in charge, losing to the Bulls, and the Stormers made the Super Rugby play-offs in four of the six seasons they had under Coetzee. Since the introduction of the conference format, the Stormers were SA conference champions for three of the five years they had under Coetzee.
Whilst I think he has been a disastrous, "out of his depth" Bok coach (who should resign), I think it is hard to argue that he was not at least among the most qualified to take on the
job (at the time), alongside Ackermann, assuming SARU wanted a South African coach.
I would like to see him resign and for either Ackermann or a foreign coach to take over (unlikely I know).