Certainly not the Luna Wolves, but when looking at the other legions, it seems that in many ways the Corrupted legions where "limited" or had flaws of their own in form of tactic or genes or even something more.
I go down the list and it seems that their primarchs were stubborn in their ways or less concerned about the growth of the crusade. Magnus and Fulgrim's legions both suffered tratedgies to their gene stock than most legions for example. Angron was in it just for murder. Mortarion enjoyed demonstrating how tough his legion was by limiting his weapon choice and sending them like a tide. Perturabo decided his legion was better off garrisoning and baby sitting planets. Alpharius seemed to be more concerned with how his tactful battles were fought. Logar was more concerned about developing his worlds to the Imperial Faith. And Konrad Curze used fear and ways that were frowned upon to the Imperium.
I have breached upon a touchy subject, but I am interested in people's thoughts over what they think about the corrupted legions to legions like the Ultramarines, Dark Angels, and Imperial Fists. Where these legions searching for a way to show their legions were superior by joining Horus? Are they truly underdog legions compared to the loyal legions pre-heresy? Or do you think that these legions were just as accomplished as the loyal legions?
The reason why I ask, is because I've always wondered if there was anyway the Chaos Gods could have indeed corrupted the loyalist legions in a alternative universe.
I was hoping to avoid a debate over the Lion being a fence-sitter (as it has been argued in many threads), but somehow I have the feeling that sooner or later it will come up. I think it comes down to whether or not it was either the worlds and upbringings of the primarchs that seeded this ability to corrupt or something else entirely... something deep.