I was actually looking for the specific stats on Legacy Orbital Strike, but I thought I'd give my two cents on this, Though if anyone knows how it works I would appreciate it. Do the stats increase with level? I haven't been able to tell.
Now, as far as this discussion goes: I've leveled 2 classes to 50 and am working on a 3rd. I currently have legacy orbital strike, and force choke. Along with coordination, and unnatural might, these absolutely give my new Sith Socerer a marked advantage in leveling. However, it was earned! I love legacy abilities. The whole idea is great. It gives you an incentive to explore the game from many angles, As far as the powerful abilities go, such as orbital strike and force choke, they are tempered by their use limitation. Essentially I save them for bosses, and those rare times I get ambushed by an elite or something.
So, for those who say they are too much. Don't use them then. For those who say they are not enough, I disagree, They are tempered fairly imo.