Can't really see around where the arrow is, but it does look like the shim is broke from this angle. REALLY hard to tell. Can you move that rocker at all? That shim should be a full circle, so if it's not, then yes it's broken and YES you need to replace it. Measure it with a dial caliper and order a new one with the same thickness.
The lobes on the cams don't look too bad, they look normal. Best thing to do is to scratch across them with your fingernail and see if you feel any pits in the cam lobes, like they're actually scratched from the rocker arm.