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And Vigilents wouldn't be useless anymore.

In my limited experince, a 'good' use of locks are when the opponent would first have to move the model to engage, this is because breaking a lock happens during the attack portion of the models activation, ergo they must forfeit that turns movement.
Examples:
1. Locking from behind a model. Even if the lockee breaks the hold they will be unable to turn and face the locker, eliminating the fear of focus/fury fueled counter attacks.
2. Locking at reach. This is a gargossal only perk, as they can use their natural reach on power attacks to lock a model without reach. Again, even if the model breaks the hold they would be unable to retaliate.

 Wehrkind wrote:
I think they need to let lights lock heavies, if they pass the str test. That would make it more reasonable to use, since the light won't likely kill the heavy, but can slow it down. Plus it is cool to imagine a lot of little guys trying to swarm a big beast or jack to keep it busy.

Up until the Errata after the Stormwall was released, Lights COULD lock Heavies. In fact, the Minuteman jumping behind a Heavy and arm locking from the rear was a pretty common tactic. That round of errata was a huge nerf to 'Locks.

I still like it for situations where I can't really hurt something but need to keep it in place.