Along with his heavy damage capabilities and with speed on his side, it will certainly be useful, especially as a passive. Can't be sure yet, but I believe he'll draw more hate than Engelbert at least, even Rain; current main magic tank. Plus, with his resists and the dark lineup, he's gold. Imho
Everyone seems to be forgetting he has flat dark resistance down. EZ mono dark raid team right there.
Sterne 120 has flat slash down.
The combo would be ez to force dark slash teams in any raid/boss content.