I just encountered him on the second campaign in a Skirmish game. Sadly i think he is far more powerfull then the Knight the Space Marines can field themselves. The thing that makes him overpowered is not, that he can kill a unit with one shot, both of them can, but the amount of bullets with his "precise" aim. It shoots at one target, but with the one hailstorm of bullets can wipe out multiple units at once, cause he misses so much and just kills everything in sight. Ok, if he shoots close to a close combat, he wipes out the orc units too, but that denied me almost half of the XP my units could have gained in that battle
After that thing killed all of my army but my Dreadnought, i ran away with that one and one over time, not a satisfiying victory, but in war its only the victory, that counts
