Depends entirely on the size of it. I was in a land cruiser years ago and we hit a big one front on at 110kmh. It crushed the front in, smashed the windscreen and a portion of the roof above.. new car was needed.

With small ones though, depending what you're driving it's a repair job. Most people here have pick ups with bull bars, hit a small one in those and you're all good..

Where I live roos are extremely common, they get hit daily.