Okay well I'll be the first to take a stab at it

#1 - It's out of focus and crooked
#2 - I like the composition in this one. The DOF is great in the front of the picture and your chocolate is sharp. Very nice.
#3 & #4 are both out of focus. I'm missing your focal point on both of them
#5 is too dark and the shadow is distracting and it's out of focus.

Shooting food is tough. On all of these you need a fill flash. Go on Flickr, view tags of food photography. Most of the photographers post their set up. Here's a good one to look at Food Photography - a set on Flickr He does a lot with food but those are his most recent.

Are you using a tripod? If not, use one. Use your timer...again. This will eliminate any camera shake. You may think your hands are steady, but they aren't

IMO if I was your boss, I wouldn't use these ate all. *shrugs* Just trying to help you.