We have a dedicated forum full of threads about possible builds for each major class here:
http://forum.bioware...classes-builds/
All your companions use the same abilities as you would, so they apply for them, too.
P.S.: Otherwise, if you just think you messed them up somehow and would like "fix" them without thinking too much about it, there's always "Auto level up".
I disagree entirely with the postscript. If the problem is that the companions aren't acting the way you think they could be, I don't think letting AI determine how to build them from now on is going to provide a satisfactory outcome. On paper, it might look good, but sometimes, you really don't know until you try.
My suggestion would be to make a named save, so if you goof, you can start over, make the changes you think might work, then go somewhere only moderately intense to practice and see if it works better. The rogues all need armor and you wanted to take the boys out hunting anyway. If it doesn't, you can decide to make further changes or go back without having to replay or buy more amulets. You can see if what you've got in mind is more fun, and still decide for yourself which areas you want to tweak. Plus, if it works, you'll have some bearskin or corpse hearts.