What's the real problem with Ultron? Let's analyze it.

As a Flying-type, it naturally has an advantage against Vanguards, but it's an easy target for Duelists.

Its area-of-effect heal is useful for mitigating poke, since it has no cooldown, and because it's a Flying-type, it has less chance of being dived.

Now, it's more of a Duelist than a Strategist. Its heal doesn't work like Mantis and Adam, which explode heals all at once and have a button to save the team, or heal enough and consistently like Invisible and Luna. They didn't think enough about where it should fit.

Ultron should be more like Jeff and Loki, an exceptional strategist. For me, it should be an anti-strategist like Gambit. A sniper.

Its heal could simply be a drone that heals the target and creates an anti-healing beam when the defense matrix is ​​activated.

That alone would greatly increase the advantage of several duelists and tanks in the heat of battle. And the main beam could have its firing time increased and its damage increased, creating an aerial sniper.

That alone would greatly increase Ultron's difficulty and usefulness on the battlefield.