I don't think M. Aurelius was that good of a general, his campaigns were too passives. Instead of the conquering the Germans once and for all, he made a campaign of really just trying to keep them out of German, subduing them only temporary.
By the way, and no offence at all,shouldn't it be Gaius Julius Traianus, thats the real way in latin if you intended it to be a true latin cognomen form.