I had two problems with Horner.
The first was where F1 could have had better cost controls years ago but as laid out in ex Williams CEO's book The Art of War, just as everyone had agreed to a cost management plan for F1, at the very last minute, Horner sold them all out.
What I hadn't realised until today was that Horner was a protege of a certain Mr Bernie Ecclestone and had been close to him prior to taking the Red Bull role and apparently was at one time considered by Bernie to be the heir apparent.
The second, and this is not directly his fault, was the never ending love affair between Sky and Horner. You can't tell me no other boss would talk to F1 from the put wall, before, during and after the race? Look at it now, the mic is shared about and we hear from all angles.