All this talk of this job and that one being OP is amusing. Everyone is OP when people are actually working together, while your party isn't. One of my recent runs had a party with 3 SCH. We didn't win.

4.5k /tick is the buffed amount. It's not always going to hit for that and it's not factoring the shield buff or other conditions. As it's been noted, the bigger the group of targets, the better it is. It's easy to shrug it off if that's the only attack coming in.