I don't think they are all hopeless. It seemed a task designed to make them struggle, to see how they coped. The group in the sushi restaurant had the hardest task, I thought, because none of them claim to have any experience in sushi and they did OK at lunchtime. They made a key error in understanding what would happen if they focussed on orders instead of stocking the conveyor belt, but it was something the manager could have told them and a mistake that once learned they wouldn't necessarily make again - and all of them seemed genuinely distressed that the night had gone so badly.
JJ can't cook, which I suppose might not be an issue in whatever a 'picnic restaurant' is but stuffed him up here, especially as he was in the kitchen with by far the best cook, who seemed to shine from what we saw. JJ is an unlikable idiot, but I did start to feel sorry for him with 10 minutes to do 17 dishes and when RB was standing over him. JJ's friend seemed worse because as long as he thought he was being charming he didn't really seem to care that the customers weren't being fed. But I am quite curious to see what special hell a picnic restaurant is so I'm not sorry they stayed.
I don't understand why the Pizza express one was so difficult - I'd expect both those women to be able to cook pizza and salad more than I'd expect the 3 in the sushi place to cook sushi first time. Maybe I'm missing something but I couldn't see why it would be so hard?
I thought the right couple went. They messed up hopelessly and they didn't care about the customers at all. I thought he'd had more than one Guiness by the time he came to make that speech. They weren't serious about a restaurant at all - none of the sushi couples deserved to go before them.