Gimmicky. But not turrible. They put the spotlight on the goal scorer and wash things out in red.
I'd probably pass, but it's not the end of the world.
As was mentioned though what if there is a scrum after the goal - I guess they'd just have to watch for it and put the light back on quickly. A good time to suckerpunch somebody though.
Another thing - it will look pretty ridiculous when we're getting blown out and put one on the board to make it like 6-2 or something. Like when WR's posture and showboat a first down when the team is getting blown out.
I'd save it for go ahead or game tying goals.