Blanket coverage -- is it good?

I've got platinum blanket coverage on Sainristil to boost up his man for my blitzes. Does it actually do a good job or is it one of those that just never activates//feels like it doesn't do anything? Defensive abilities have been kinda hit or miss for awhile aside from quick jump and house call.

Personally I rarely run Man Coverage but when I did use it I didn’t notice any benefits. I’ve also not heard very good things about it in comparison to other abilities.