Just a question: Is there any chance your DM was deliberately overmatching you and giving you a chance to recognise it and run away? Because I think that that is one of the really good things about 4e-- there's enough room for error with the extra hp and such that you have the opportunity to see a situation going bad and try to escape.
In hindsight I would have to say yes that is a possibility since we all got emails that we have the option of waking up as prisoners or trying out new characters. I'm not convinced we could have escaped once the fight started.
But I believe without the terrible PC rolls (or that blasted orc cleric) we might have won.