This is due to the new "next to an INJURED survivor" condition on protection hits. Mettle of Man is just as hard to proc as it was post-nerf. If it is any easier, it's not noticeably so.
After the PTB I made the suggestion that it should be 2 protection hits. I stand by that suggestion.
I agree. Or just make protection hits count for all hits taken when near survivors with a 3 second buffer. Then you could actually get it to proc at least once during a typical match (that you are TRYING to proc it in.)
2 hits in order to proc sounds good, perk still boosted , and the protection hits still very inconsistent.