I main a merc and a sorc. Sorcs are in a strong place atm defensively in almost all situations, true enough. Mercs have issues surviving in solo ranked, but that's okay since I wouldn't trade its utility with electro net, damage output, or overall playstyle for more survivability. I don't particularly enjoy playing merc in solo ranked, but in regs and team ranked the survivability isn't weak at all. I run I.O. Merc with a marksman sniper in group ranked and we consistently beat fotm double hatred sins / double AP PTs. Mercs are in a fine spot for team ranked, and that's all that matters in the end.