Due to the popularity of a certain 1950s TV dog, rough collies have become a breed that's synonymous with wholesome family doghood. But while they're absolutely excellent animals, they may not be ideal for every situation.
Rough collies are better suited for families with older children. As sheepdogs, they have thousands of years of trainability behind them, but also the instinct to herd whoever or whatever happens to be around, making them a poor match for a family with a young child. That is, unless you've got the type of kid who falls into a well, gets attacked by bobcats or is pinned under a fallen roof beam in a burning mill at least once a week. Collies should come standard with those kids.