The Amazon review covered the plot really well so I'm just going to give some of my impressions after reading. Alright, I picked up Kitchen Princess unsure of what to expect and ended up being really happy I purchased it! KP may rely on some typical shoujo plot devices, but it still manages to feel fresh and cute. The emphasis on cooking was great. Najika uses her kitchen skills to make others happy in a sweet, non-sappy way. The art was fitting for the story. I personally enjoy Natsumi Ando's style. Her characters are all attractive with a wide range of expressions and poses. The backgrounds are well- rendered and are more detailed then I've seen in other shoujo lately. And the food looked delicious ^_^
Del Rey hasn't done a lot of (if any) shoujo, so I was really happy to see them publish this. The translation reads nicely and I didn't spot any obvious spelling errors. In the back they included their standard translators notes and a preview for volume 2. Also included in the back of the book are recipes! You can find out how to make all the tasty treats Najika made.
In the end, Kitchen Princess was a really enjoyable book. If you like shoujo, KP is a great title to add to you collection. It's cute with good art and a lot of promise for future volumes (I can't wait to find out who her prince is!).