Is it acceptable to take your partner to a restaurant and then refuse to pay? Watch
If you are planning to do this before you get there, which clearly you are, you are attempting to obtain goods by deception which is theft and fraud.
So obviously no it is not acceptable- but unless you are an idiot you know that already.
I was refunded a meal that I disliked in a restaurant (even though I said I'd pay - it wasn't their fault I disliked the sauce) but it was evidently uneaten!
If you can't afford it go somewhere cheaper or have a night in. If you're trying to impress a girl, the effort of a nice cooked meal might be worth way more.
Your plan wouldn't work anyway as anyone who's worked in the food service industry knows that if someone's eaten all of their meal and then complained, they're just trying to get a free meal or money off the bill. If there's something genuinely wrong with the meal that warrants a complaint then it would addressed a couple of minutes after starting to eat so it could be sorted out there and then.