<p>My simple thoughts:</p>
<p>1) If in doubt about enough light (unless you are told to not use flash), use flash. If have to use no flash, sacrifice noise for faster shutter speed.<br>
2) I agree, should be delivering at least 350 images for that many hours work.<br>
3) Not being able to talk to the client directly was a terrible handicap for you. You've got to talk about style and expectations if you want to please them.<br>
4) Chalk this up to experience and learn from it. Every new thing I have gone into photographing, no matter how much I practice, I learn twice as much from the major and minor mistakes I made shooting it for real the first time. Learn and come back stronger next time.</p>
<p>Good luck!</p>