The problem with the golden/silver goals rule is that the people who implemented it didn't think of the fact that teams would change their tactics according to the rules. The golden goal rule is great in theory, because people would have thought "Hey, wouldn't it be great if a single goal won the match? Then teams would come out attacking so they can kill the match off quickly". Unfortunately, the gg rule led to defensive football from teams that were too afraid to concede a goal.
At least with the silver goal rule, you're in for an exciting 15 minutes of football, as the trailing team attacks with all they've got. Unfortunately the length of the halves means that this only happens for about 5 minutes on average :down: