Nah, they're tricky little buggers. Had one that did nothing but side-dash attack so I couldn't land a hit on her. I found that most Peacekeepers function In the same way as Valkyries. If you're using a non-assassin character, keep your guard to the side to prevent zone attacks, but be ready to switch to top guard on a moment's notice. Which hero do you usually play? I may be able to give you some pointers.