essentially ruined -- or , rather , overpowered 
(ROOT (VP (ADVP (RB essentially)) (VP (VP (VBN ruined)) (, --) (CC or) (, ,) (INTJ (RB rather)) (, ,) (VBN overpowered))))
(ROOT (VP (ADVP (RB )) (VP (VP (VBN )) (, ) (CC ) (, ) (INTJ (RB )) (, ) (VBN ))))