I have never found a single situation where cover was useful. Nobody stays 6 yalms close enough at any given time to have the effects stay on and it only protects against physical attacks.
TL;DR, this move blows, and could be easily buffed to be more useful or replaced outright.
Why not have the move cast on all party members regardless of distance but absorb 50% of all damage(both physical/magic). This is how it works in LOTRO and it works great for Captains in that game.
Or why not bring back Divine Veil from 1.0? I've never played it but from the description it seems pretty awesome, much more helpful than crappy Cover.
Thanks.