I live in the Medway towns where Arriva is the dominant operator. Last week I travelled on a bus operated, under council contract, by a local operator. Overhead a discussion between a passenger and the driver to the effect that they use his bus when they can as it’s reliable, unlike the other lot. This matches my experience too. If the new boss can improve things, that would be great. They can hardly make things worse.
Going slightly off topic here.
To be fair, I also live in Medway and they are not as bad as people make out. Yes, Arriva has its issues, but the last timetable change seems to have improved reliability. There is still a way to go, but the investment in new buses that Gillingham has seen will help, as it will increase the reliability of the actual buses.
Most of the issues around Medway aren't the operator but the fact that the roads are poorly designed, meaning that if one small section of road has an RTC or roadworks on, then it causes a massive impact on a wide area, as there are not many suitable diversion routes. Take the A2/M2 - if there are issues on here in the Medway area, then drivers divert via the Medway towns and Rochester to rejoin near Shorne. This knocks out the Rochester bridge and often the Medway Tunnel. If there is an issue on the A2 in Gillingham, then every back road and possible diversion route is congested. There is no easy fix to this, as without knocking down parts of Medway to build improved infrastructure then this will not help.
Arriva will always seem to be more prone to not being as reliable because they tend to run a more frequent service on their routes than ASD, Nu-Venture, and Chalkwell. It doesn't matter who the new boss is, as it is unlikely to improve, and this is not 100% Arriva's fault.