My dad just had a colonoscopy, found out he has a tumor..?

I am the daughter.. and am very worried.. My dad will find out next week if its cancerous..either way will have surgery.. The doctor who would perform the surgery has a bad rating on that medical site = ratemds.com.. I don't know what to do, should I ask my dads doctor for a second opinion.?. as not crazy about having this other doctor who got the really bad reviews.. taking care of my dad. i am beside myself, and very upset.. what should I do?