All exotic armour is situational. Just look at the Crest Of Alpha Lupi for the Titan and Hunter. They have been useless exotics, because no body really needs a faster revive time. Now with Trials they will incredibly useful! If the Hunter's Don't Touch Me gauntlets were avaliable before the Dark Below we would have all considered them useless as well, on Crota's End they are more useful than outside of that raid. Sometime in the future there may be a raid or something that the shoulder charge becomes a main strategy and these exotics may be of use.