To complain or not to complain...

Folks I need your input here.  As you have seen we recently visited Rome for a short break.  The weather was the big story during our stay.  However, the trip home was marred by a severely delayed flight out of Rome and a complete vacuum of communication from BA to their passengers.  I am a person who appreciates good service and my expectations are not so high that I'm often disappointed.  As long as the service is friendly and as efficient as it can be.  So, when I do complain it is usually for a good reason.  So, here is my question to you.  Would you complain if you experienced what we did (all fully explained in my earlier posts if you need to catch up)?  Would you have a go at BA and what would you expect as a reply from them?  Would you want some kind of compensation (vouchers etc.) or just a sincere apology for your inconvenience?  And do you think our complaints ever make to the people who could actually change things? I'd love to hear your thoughts!