I steer clear a lot of times now and pay less and less attention. I don't trust much of the media at all, they are there to generate views and clicks, and it has become unbearable IMO in the USA. Most reporters are trash, I dealt with even local ones many for a former job, and they were not the smartest people (that is putting it lightly), I am not sure how they are being hired for roles historically important.
That all being said, I generally check a news source occasionally that I know aligns with my side of thought, and then I will go check on a source from the other side. I like to read both, and get my summation from the mixture.
I know your question was about aggregators, but that's the best I can do. I have seen ads for "Ground News" which apparently reports the same story from different sites, shows you each sites political slant and/ or neutrality, and shows you who is choosing to cover the story and who isn't, etc. Not sure if it's as good as it sounds, but it looks cool from what I have seen. I think it is a subscription, fwiw, so it won't fix the paywall issue.