Unfortunately this is a 'vote with your feet' situation. If you don't like who is managing your 401k, then work for another company (which is drastic, I know).

Unfortunately this is a 'vote with your feet' situation. If you don't like who is managing your 401k, then work for another company (which is drastic, I know). The other option is to simply write to your plans administrator. Tell them your concerns and organize a letter writing campaign if you are really concerned.