I'm using galadriel in caster form with her mirror, makes glorfindel pretty much invincible aslong as you look after him. I'm actually using armored wood elves, I'm not sure if legolas will be included yet. One of the main threats is obviously arrow fire, to counter that you simply cast blindng light and shoot them to pieces! Although it's a smaller army from my experience if you get the charge and position your units properly you can trap what's left of their army! I usually try an trap their Heroes and kill them if possible! Usually after the first round of combat I've killed a hero and out number them
high elves are too expensive IMO. Also armored wood elves look amazing! And I'm not talking about those nasty galadrim!