There's a difference between the onboard service and cabin (and god are BA shit), and the flight safety.

That said BA earned a hell of a black mark when it chose to divert to Heathrow rather than Stansted or even Gatwick when its engine was on fire [1]. Not as much as when Air France decided to divert from Lebanon to Damascus in the middle of a civil war rather than Cyprus because it was cheaper [2]

[1] https://www.standard.co.uk/news/london/ba-flight-returns-to-... [2] https://globalvoices.org/2012/08/26/france-an-epic-flight-fr...