We just bought a medium-sized George Foreman grill and I grilled some
chicken breast to try it out. No grill marks whatsoever. Might as
well have been cooked in an ordinary non-stick frying pan.

This particular grill doesn't let you control the temperature so maybe
that has something to do with it.

A more careful analysis of the grill marks on the foods used to
illustrate the packaging revealed uneven spacing and certainly no
correspondence to the distance between the ridges on the actual grill.
Completely faked, and badly at that.

I realise the grill marked bits won't taste like the real thing, but I
do like the look of it.

Did I do something wrong or are they really misleading the public?
What electric grill would go recommend?