Apple, Microsoft, Google, Sony, Nintendo apparently live in another world, given how many of their studios or VR/AR endevours rely on Unity, or give it tier 1 support on many of their projects, while everyone on HN complains about it.
I guess they get special builds no one else has access to. /s
Being used often for projects with cheap production budgets and being good are orthogonal concepts especially when talking about the video game industry where cobbled together middlewares for one shot development is the norm. Unity became tier 1 supported because it was widely used by indie projects. Implying the reverse is mistaking cause for effect.
In fact, Unity is actually the example I generally give of a product which is both widely used and terrible. It's better than it used to be. At some point, it was downright terrible. I remember Wasteland 2 running worse than a modern AAA game while looking like a ten years old game at launch.
To be blunt, given the new licencing terms of the Unreal engine, I don't think you should ever use it unless you are already really familiar with it.
I guess they get special builds no one else has access to. /s