It's all unrealistic, I get that it's in part to see how they think on their feet (along with of course making for "dramatic" TV), but ultimately they're set up to fail. E.g. how are you really expected to design a coherent product and branding when you have 2 different groups of people doing it without being able to communicate throughout the process?
Obviously it's not helped by the candidates being complete morons - yes of course a lot of that is due to editing to make them seem worse than they (probably) are, but even still, it's like none of them have ever actually watched the previous series.
They ALWAYS cut corners on the corporate day task, and it ALWAYS backfires, you'd think they'd have learned from the mistakes made by their predecessors by now....
Doesn't mean we're going to stop watching it though, highly entertaining to see the rookie errors they keep making