What about just barring unsolicited communication? Forbidden Island works for my local mix of adults, old, and young children if it's given that restriction. If it isn't then the older and bossier players (yes, me) try to be too controlling.

I like this idea. It doesn't eliminate the problem of making the game potentially too easy if there is one smart player. But it does eliminate the social problem. Asking for advice from others is an entirely different social interaction than having another give you orders!