The term "good service" is subjective.
A few cancellations won't be seen universally as being good, and therefore they are opening themselves up to criticism if they say that. Different people will have different standards or expectations.
There will clearly be a wide range of opinions regarding what the meaning of 'good service' is, or should be; some people are going to get 'wound up about it' while others may conversely get 'wound up' at the idea of people being 'wound up'. Others may disagree on whether their comments qualify as being 'wound up'

Such is life!
I think we need to accept there will be a range of opinions on this, as with any subjective matter.