Wraith's the void so stupid on final ring!

It’s perfectly fine, it’s called playing smart and saving your abilities/ ultimates for the final ring 

lots of legends have abilities that seem OP in the final ring such as Gibbys and Bangalore’s air strikes, Rev’s totem for a free push, Caustic’s gas ect. 

You just have to outplay them using your team’s strengths and if that doesn’t work trying playing more aggressively, a Wraith can only survive the final ring with her tactical and ultimate if she’s left alone uncontested until the ring closes, push her with your team and either kill her before the final ring or force her to use her abilities to escape then she’s got no invulnerability left for the final round

you can’t get into a camping battle with a Wraith and expect to win because she’s going to win every time, instead of just ‘holding out until the ring kills everyone else’ you actually need to push and initiate fights or you’re just going to lose against teams that can outlast you in the ring 

Or just try playing Wraith yourself if you think it’s that OP