Yup, little teams like Rovio with there obscure games about pigs trying to steal eggs wouldn't dream of something like that. Or that game no one's heard about where you launch aliens into space. couldn't possibly work in Unity.
Yes, it's good enough for games that rely on brand/marketing more then tech. Also good to increase the profit margin, since you don't need to hire developers - scripters should be enough for most cases.
unity is great for young devs, prototyping and content creators, but it's not that much open so I doubt many dev really like to use it.
still a great thing for mozilla though