Do I have to have watched Arrow to gain context for this show? Because I love The Flash and I forgot this came on last night, and I don't watch Arrow.
I would really recommend you watch Arrow first if you think you might like it. You don't have to, but there is a bit of continuity between the two. Not massive, but if you find you really enjoy Arrow you'll enjoy watching that first, I think. If Arrow's not your thing, though, you should be okay without watching it.