[nihilocrat]

Clear, meaning: we want our games to be fun. Startups also have pretty clear goals: make something of value and make tons of money while doing it.

Poorly-defined, meaning: one man's fun is another man's boredom, it's hard to pin down what exactly "fun" is. Thankfully, though, there are many good educated guesses, so we can't act like "fun" is impossible to define.