Why Is Some Wacky Better Than Other Wacky?

Here’s the new Skittles ad:

It’s perfectly fine.

But it’s not:


It may be down to the darker edge in the last two. It feels like the dilemma of the Touch guy is really quite tragic, which is what makes it funnier. And the Sour guy is a complete arsehole who is willing to ruin the farmer’s business. Having said that, I don’t know if this one conforms to that rule, yet it’s still one of the best:

God knows.

Any ideas?