That's scary!
From the toolset standpoint--that of of selecting an effective defensive weapon, the victim did well. In a sound version of the video, I think I counted thirteen shots. That's more than I carry.
Skillset? He fired sufficiently rapidly and scored effective hits.
Not to second guess the defender, but it occurs to me that, had he moved a little more quickly in going from car to house, and kept up his awareness, up, he might have been able to avoid the attack. We can learn from that one.
I agree that he should not have chased the attackers. I also wonder about his seeming to shoot as they fled, but I cannot see enough to comment.
Was it a carjacking attempt? Were the perps targeting Asians on purpose?
That was a close one.