I came on to say Nando's, but can see I am not the only one who has noticed it is overpriced, dry, boring chicken with some nicely branded sauces!
I don't get IKEA full stop. Everything looks cheap and generic, the queues are insane, it is like a maze inside, and the food is beyond inedible (when you eventually get through the queue to get it, and then the second queue to pay for it). Though I do like their Daim bar cake- so there's that. And they do watch DS for an hour for free which can be handy. Oh and their live plants are decent. But in general I don't get the hype!
Costa. Bad coffee, worse treats, even worse food. Give me Pret or Nero, or even Starbucks any day. Also their staff always seem so hapless.
Of things that haven't already been mentioned:
50 Shades of Grey series (books and movies). So badly written and badly acted.
Glamping. Equally shit as camping at 4x the price.
Malta. Nothing spectacular there. Felt like a more uptight Tenerife- though some spots were beautiful.
Ant & Dec. I just don't get them.