I just played the guy that the
OP was talking about.
I had - sternguard in razorback, 2x tacticals in razorbacks, 1x tactical in rhino, Ironcald in drop pod, Lysander, Vindicator and a land speeder.
He had - Dante and Sanguinary Guard with Sanguinary Priest, 1x tactical, mephiston and razorback, 2x furioso and vindicator
I got first turn, but he stole the initiative. In his first turn he wrecked one razorback and half the sternguard in it, immobilised and shocked the speeder and stunned the vindicator.
In my first turn my drop pod scattered too far so I popped smoke on my Ironclad. One razorback and the rhino moved 12 and popped smoke, and the other razorback moved 6 and managed to immobilise his Vindicator; my vindicator moved 12 and popped smoke, the sternguard managed to get a single weapon destroyed on one of his dreads and a shaken result. The speeder was out of range.
His next turn, all of his reserves turned up. Dante and guard destroyed the Ironclad in the shooting phase, Mephiston detroyed my Vindicator (rolled just one six to hit, then wrecked it), his razorback destoryed my speeder and he killed all but two sternguard.
I gave up before starting my second turn as I wasn't in the mood to watch what little I had left fail to kill anything and slowly get killed.
This guy gets such good dice rolls, it's unreal. He also makes every game feel like a chore