I'm not sure how to put this about coming off as rude or cruel but I feel like the person on having an Rp with is putting their effort into the role play play and put an absolute zero detail to a point that I can't extremely bored and a few minutes in

What should I do? I'm not an extremely fussy person I was hoping put some effort Into the rp.

I say tell them bluntly but kindly I had to withdraw from a roleplay due to the fact that the person's OC was a Mary Sue and they put no effort into the oc at all and made the Roleplay invole entirely around them and their oc