Jimmy is a gamer and wants to know if he should upgrade to Windows 10 yet. Leo says that the biggest reason for a gamer to upgrade to Windows 10 is DirectX 12. But the fact is that a lot of existing hardware won't support DirectX 12 right out of the box. And users have a year to upgrade for free, so there's really no hurry.
It's probably best to play wait and see, at least for a few weeks, just to see if there's any major league problems for others. Meanwhile, Jimmy should be on the lookout for new drivers for DirectX 12 support.