Of the "Focus fire" ability for T4 Terror owning, being bad or average.
I have had it used against me multiple times, i have had my infantry 'owned' by it, but then howied, mortared or used a tank to get rid of it.
Failing that, i see the 'focus fire' appear above the mg and go away. I mean, Rushing an mg is bad, focus fire makes it worse yes, but if im correct it actually makes it easier to rush the mg with multiple squads.