I play in Arena with Palp lead Vader Thrawn Krenic and DT. This team is very tanky, fast and Krennic can do insane dmg on basic. Like beetwen 32-40k. Those who say that he is not so good probably dont have him with maxed gear. He needs full crit dmg and piece of gear 12 with Resistance Penetration. Also he needs mods with high crit chance secondaries to crit more often. Under Palp he is very fast couse every skill is giving him 20% tm minimum. I use Krennic in Sith Raid phase 2 and he crits for almost 100k from basic with cycle of suffering buff.