My LS leader tanks Miser as PLD with a DPS build (MND and STR at or as close as possible to caps). The MND will multiply the hate generated from your Flat Blade and Spirits Within combo much more greatly than any healing or Emnity would help you with. He's tried it as WAR too, but the WHMs prefer him on PLD because he's easier to heal. The group has well geared MNKs, yet, he always tells me Miser is an easy straight tank job (compared to things like Garuda or Chimera).
I think he's able to pull it off because DPS wise he's able to do as much damage on PLD as he would on WAR.