I would argue that the nanomedic is more similar to explodemo/desochem/artyfo in that it has large AoE templates and does not use ammo. The primary difference, however, is that nanomedic is the safe version. Unlike marksman/rifleman, these classes could theoretically just go weaponless and barely lose any effectiveness. The three starter classes' offensive trees are, in effect, simplified and safer versions of more advanced classes' offensive trees. (rifle --> amm/mando, med --> demo/chem/fo, ass --> mando) To me, this seems sound from a design standpoint.