Would you say that any of the classes on 1.65 just arent very viable toward endgame and RVR , if so which ones and why?

In large scale zerg/keeps everyone will be pretty viable.

In 8v8 thanes will not be particularly welcome unless you build the group around yourself. 30min purge, lack of determination and a mez breaking stigma hinder the class to a degree.

Hunters are going to have a rough time with stealth wars and will have a much harder life solo due to See Hidden.

That being said even 8v8 or solo all classes are viable some can just be replaced easily though.