No, it's not worth it and nobody should get it out of spite of Apple completely ignoring their Mini userbase.
Yeah, sure, if I had a gen 1 Mini I'd probably vouch for the 3 due to Touch ID, but aside from that... there's not a chance I'd upgrade.
I was really lenient about wanting to upgrade this year. In fact, I would have even if they just barely upgraded the specs. I was hoping for a thinner form and lighter frame, but the fact they didn't even put it on the same chip as the Air tells me that they're not viewing the Mini in the same category, which differs from how last year seemed to work with the Mini.
This is tremendously insulting to all Mini users.