If SSP or their staff think that any of the above is even vaguely accurate, they must have a even worse relationship with the truth than our current Prime Minister.
At best you could rate them as "acceptable". "Good enough" or "better than the alternative [of a vending machine / draughty platform bench]" are other ways to describe their offering. For myself, and I suspect the majority of their customers, the only reason I use SSP outlets is because of the convenience factor, and I'm well aware I'm paying a premium for that - not the quality of their products or staff.