Holes are ok - as long as they aren't too big. The microwave signals can still reflect from minor holes in fabric.
But dents and rips and bends reflect the signal AWAY from the receiver/transmitter at the middle and increase static to unuseable levels.
Having repaired a few dished hit by lightning and ice damage you really won't know until you re-aim the dish and check your levels.
Sometimes you get lucky and sometimes you need to get on the horn for a new dish.
Since that dish doesn't appear to be pointed up at a bird I'd sayu it's toast. That or the guy is weeping in a corner somewhere to shell shocked to even tie his shoes.