current meta strongly strongly favors valkyrie because having cameras placed anywhere is insanely useful. outside of that hibana can be useful for making reinforced walls even more obsolete. mira is also a p strong choice just due to how versatile her mirrors can be along with how great the vector is.
frost used to be super strong but i personally think that with a little game sense the traps can be completely avoided against a decently coordinated team. buck plays a lot like sledge but maybe a little bit more versatile because of the weapon choices. blackbeard used to have a super good shield but now its just two 60 hp shields. caveira can be a solid roamer but others have more solid guns and abilities like jaegar or bandit. jackal can be good as an anti-roamer but thats about it.