Where is nuclear energy too cheap to meter?

Measuring success this way is nonsensical. Is there anything that is too cheap to meter? Are other forms of energy also unsuccessful until they produce energy too cheap too meter? This isn't serious criteria.

The argument is that this is a silly framing with which to judge success. I agree!

I for one am extremely content consuming energy, more than half of which is nuclear, followed by hydro. It is very successful.

Measuring success by whether the proponents delivers on their promises seems entirely fair.

By that criteria, everything is a failure. After all, it's the job of the proponent to oversell you on things.

What sort of life experiences have made you come to this conclusion?

Has nobody ever told you "come on, it'll be fun" and proven to be right by subsequent events?