As the topic says it's been buggy for awhile now and grainy graphics definitely detracts from the enjoyment of the game at least for me.
Any word on the gfx patch?
What kind of graphic issues are you referring to?
I think it's the known one where the in game setting will not keep the screen resolution and some Settings.
When talking about grainy, the first thing that popped my mind, would be the ambient occlusion setting, which adds a grainy effect. The loading of textures is also grainy, but I believe this is an unreal engine thing as Fortnite loads it exactly the same way.