Hmm. I might need to go look at how I described things, but no, crits should still be rare as the system should be largely unchanged from 1e.
My intent was that you still take the top value across all dice, just as in 1e, so crits would only happen if one side rolls doubles that are higher than both the other side’s dice. If that’s not clear, or if a strict reading of the rules doesn’t support that, I might need to tweak the 2e explanation. I’ll try to take a look at that today.
Thanks for asking. It’s difficult to detect points of confusion in the rules when you’re the one who wrote it!