The only thing you really have to look out for his his stun you massive hit box makes it easy for him to land it. If it is giving you trouble build resilience and he won't be able to do anything against you.
When fighting Sha-lin as Moji you must get the drop on him if he sees you coming there is very little you can do to come out in the winning side of that engagement.
General heal Pip tip: When using cimbat medic, use cards which make your explosive flask have a lower cooldown and generare ammo so you don't have to reload to heal. If you are not sure, buy deft hands as well (Personally i like cautertise on Pip).
When Buck activate his Ultimate, Khan's commander grab can waste precious seconds of said Ultimate and gives a chance for your allies to kill him fast.