Doom's biggest problem is that he fights Fantastic Four.... who for the most part are REALLY boring. They're a great concept, but their books just can't keep an audience. In my opinion, Doom works best fighting EVERYONE. Like the original Secret Wars... Infinity Gauntlet... Even the new Secret Wars. Doom is bigger tehn just Reed Richards..
And I agree about heroes fighting heroes... it's REALLY gotten old and worn out. Civil War 1&2, A v X, Schism, even secret invasion had skrulls that LOOKED like heroes... >.<