You will have no problem hearing the music in the kitchen/dining from the speakers in the living room. The better question is, will YOU be happy with the sound you get from the living room. everyone has their own personally taste, likes/dislikes. For example, i dont mind the sound of the play 5 for my own music listening preferences, while i read you were not impressed. If it is just for some background music, or to have music while doing other things such as cooking, I personally would be okay with the speakers in the living room. If you want the music to be a little more direct and aimed right at you, you may want a speaker/speakers in the kitchen/dining. Another example, some people like having play 3 & 5's, I prefer ceiling speakers for the cleaner look. You can always start with a sound bar, and build out from there if you desire more. Keep in mind, wireless speakers will still need to be plugged into power source.
Also to note, I'm using my rear speakers on my surround sound for listening to music as well, many people on here do the same. So yes, you can use your speakers on your surround sound to listen to music, if you are happy with the sound you get from it.