Hammel is a TOR starter right now and with his stuff and peripherals, that doesn't appear to be changing anytime soon.
Blah blah, WAR is flawed, and doesn't tell really accurate pictures from pitchers to position players.
Compare Jones to other CF and compare Hammel to other SP, but not to each other. If Hammel is your 4/5 starter, you are looking good. If Matusz/Britton can outperform him, Bundy comes through, and we add another #1/2 SP in FA, he'd be a killer #5. Wouldn't want to have a Lannan situation on our hands though.
I think he balances out some later. More of a solid middle of the rotation guy but don't think he's TOR/ACE material. Glad that 2-seamer has been making such a difference for him.