This is all very interesting… I have to say that I don’t think that GM is OP and this is the story why…
One rather vocal member of the forums ranked Gravemaker as a tank as follows:
So she feels that a used baby wipe is more of a threat than GM… maybe quit feeding babies curry… Anyway, because of this I tested GM (along with other heroes) in the tank position. Based on my 15 days of data collection, as a tank and I found him/her rather comparable to either Delilah or Aeron. Zeline was a bit lower on the tanky-side of things that the others.
So I quit using GM as a tank and moved back to Delilah. I would image that if GM was in fact OP, the data would have shown a HUGE advantage to using him as a tank.