>Its too shallow. The deeper I go, the less it seems to be useful. This happens quick for me.

If its a subject you are just learning how can you possibly evaluate this?

If you're a math-y person trying to get up to speed in some other math-y field you can discern useless LLM output pretty quickly even as a relative novice.

Falling apart under pointed questioning, saying obviously false things, etc.

It's easy to recognize that something is wrong if it's wrong enough.