Before we knew anything about MtK other than 'probably a melee heavy with a ranged attack' I actually started a thread surmising whether an all-in-one heavy would put pDoomy over the top, competitively speaking. Serious.
pDoomy was an underdog that looked bad on paper, but who has just enough synergy and "special unlocks" within his tier to be good. The playtest showed this. Flanzer justified the general sentiment when he took the final round of a tournament vs. Neutralyze. pDoomy still has flaws, but they are contextually bound.
MtK looks bad on paper, and the playtest has shown the model to be bad on the table as well. THAT is the difference. THAT is why calling a spade a spade is not DOOOOM, as the white knights have been valiantly trying to "disprove" without any recourse to facts, context, or logic, the sole exception being the one guy who actually made a list and tried to discuss the merits of the model within that list. Everything else has amounted to MAT9 DEF11 P&S22 ARM 23!!1omg!1