Is Commander's Sphere worth running or not?

I can't remember the last time I've ever seen a [[Commander's Sphere]] in a Deck list posted online, despite being literally in all precon decks.

It's not even on 3+ color decks.

Why is this the case? Is being a 3 CMC mana rock the red line that automatically makes a mana rock not worth using?

Do you personally use Commander's Sphere or any other 3 CMC mana rocks in your decks? Why/why not?