Giving advices when you "dont know" and telling other to rely on "LUCK"? I couldn't have put it any better.I dont know that's why i said LUCK is all you need. People calling naive is too much for an opinion, isn't it?Are you honestly naive enough to believe you can survive 5 turns before his skill cooldown is over? Up against these lineups, it usually ends in 2-3 turns, and he could always just sleep your ninja since they share the same cooldown duration and if he goes first, assuming you can even survive to the fifth turn.To be honest, LUCK is all you need that a ranger doesnt crit on his/her 1st turn but I find disrupting their formation with a ninja or disabling the "Central" ranger (usually GRane/GS Cybella/GS Nadia) working at most of my battles.
Also, buff up your front liners! Limit breaking your champs to be tanky is also a good way to withstand those dreaded crits.
Like Merad suggested, class restriction could be a way to deal with it, and I like the idea of descending proc chance (for PVP only; like how aura healing is nerfed)as more chains are activated.