Theres a lot of variables others have already listed but it might also just be bad wars

Thing about war is their tank stance doesn't give defense just more health and healing recieved
Its up to them to properly mitigate and if their gear sucks it can be a nightmare even if theyre doing things right

Darks are also quite limited
Only having shadow wall and rampart(?) For trash pulls untill 70

Aaaand you might also just be worse with x healing class
Im a terrible sch and good whm
Just a possibility
If you think thats the case plenty of good threads to help you improve
Buuuut its probably baby wars

Everyone wants to jump on the "op" tank but if theyre coming off pld where they CAN getting away with ignoring cds itll be jarring