Do you every complain about food in a restaurant?

If it justifies a complaint then yes, I'm complaining

Very rarely complain but if I’ve paid for a medium steak and it’s well done it goes back and if the food is cold it definitely goes back. I’ve had that in pubs a few times probably because lots of stuff is fast heated.

I did when I found a bit of plastic in my food!

Same - I'll complain about something specific if it's not done correctly but I wouldn't complain if I didn't like it, I just wouldn't go back. I am also conscious that when eating out, one person complaining can sometimes ruin the enjoyment of the evening for everyone by creating a bad atmosphere so I tend to focus on making the best of the evening.

I would always complain - politely, of course, but if there's a problem they should be given an opportunity to rectify it.

It does the restaurant no favours if they don't know there's a problem - you'll never return, you'll probably tell people you've had a crap meal there, and if something's a problem for you it's likely to be a problem for others as well.

Also, calculate how many hours you have to work to pay that bill, and ask yourself if it's worth it. We all work for our money and no one wants to waste it on a rubbish experience.

I've complained for the following:

Very under cooked potatoes. The staff were very apologetic and couldn't understand how it happened, they were thrice cooked potato cubes.

A pie that was described as squash and mushrooms but was 80% lentils that weren't mentioned on the menu. Staff couldn't really give a shit and were clearly used to vegetarians accepting any old crap, but I'm not even vegetarian, I just thought the pie sounded nice.

Twice when I was served crappy spread after being assured the bread came with butter. Again staff couldn't really give a shit, once was an independent pub that made a lot of noise about local artisan bread and home made soup yet thought they could get away with shitty spread, the other time was a supermarket cafe that claimed they'd run out of real butter.

I'm not the greatest cook in the world but I think that anyone running a food business should be honest about what they serve and for this to be of decent quality and well cooked. Otherwise what's the point of eating out? If I don't want to cook I can heat up a ready meal or make toast. If I'm paying restaurant prices it needs to be worth the money.

If something isn't right then you should complain, but it should be courteous and polite, no point in being a rude shouty wanker

I don’t find I have bad experiences when out to eat really - where are people going that they need to complain and ‘often’ get discounts or free meals?

If I needed a clean glass, I would say so, but wouldn’t consider that a complaint.

I can’t think of a time where I or anyone I was with had to complain about the actual food or send back a meal.

If service-based businesses don't get feedback from their customers, how will they ever improve? You don't need to be unpleasant or aggressive about it, but a quiet word with the waiting staff is perfectly fine if you are not happy with your meal (eg the food is cold, under-cooked, or whatever).
Arseholery and making a scene in order to get a discount is not acceptable.

If it's an expensive place yes. If it's a cheap chain then I don't bother. Just vote with my feet in future.

If somethings not right I'll mention to get it corrected. I'll never mention something thats minor, and never after the fact to get a discount.

Absolute scummy behaviour to complain to get money off the bill or comped items.

Usually the server is busy enough without having to put up with demanding customers as well.

I rarely complain. Have done it twice in 40 years. Both in the last 4 years.
Both for uncooked food.
How can you serve a pizza uncooked?
Obviously, a cold previously cooked base eith a raw cold topping.

Yes I do ,it’s expensive to eat out so I expect good food and service or why bother

If there's something genuinely wrong (steak overcooked, food cold, food oversalted, dirty crockery etc) then I'll politely and immediately complain. What I don't do is eat three quarters of it and then start moaning - I once sat at a table with somebody who did this, obviously in an attempt to get the food for free.

If it just isn't to my taste then no, since that isn't the fault of the restaurant.

Yes if it's shit but always politely