The so-called "fries" and would-be burgers in allegedly bread rolls, from the up-price / down-value "international" fast-food chains.
Coffee served with a cod-Italian name and at high prices, that turns out to be mainly coffee-flavoured milk froth. It's illegal in UK pubs to use the head on a pint of beer to short-change the customer. The head (merely froth and the subject of a traditional but strange North/South divide) has to be above the statutory pint or half-pint line etched on the glass; so why is legal to short-change the customer buying coffee in opaque cups with no level marks?
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I would say the over-rating is by presentation or quality, more often than the type of food. Try this, from a pub that had under its previous ownership served simple but very good food in large portions. It had been closed for longer than expected, then I gave it a few weeks to settle in before sampling its new owners' fare:
A limited, poncy, "gastro-pub" menu, but surely you can't go wrong with steak-and-ale pie, chips and vegetables. Oh yes you can, and note that latter plural.
The pie: good quality but tiny, in a ceramic pot the size and shape of a mug wiv no 'andle.
The chips (the pub might have called them "Fries", in snobbery): small, not very good; a small portion going cold rapidly by being served in a stainless-steel teaspoon-drainer the size and shape of a mug....
The vegetables: a single dollop of a pale-orange mash of just... carrot? turnip? I could not tell.
Dessert? I thought they can't go wrong with Tiramisu no doubt cut from a catering-size slab bought in Iceland. Yes, it was of reasonable quality; but I had expected it served on a plate, not a roofing slate!
To its credit the beer was good (proper cask-conditioned ale lightly cooled for sparkle and taste; not over-rated, over-chilled, over-priced, over-gassed, ISO-lager); but the till receipt bore this heart-sinking company name: "The Posh Pub Company". It had tried just too hard.
Not long after, the pub closed but eventually re-opened under a third management with a glossy website suggesting a decent menu. I kept promising myself I would try it, but then the plague hit. It did not survive, and has been up for sale for some months now.