No it isn't. For example I am a UK 7.5 but in NZ I am 9 or 9.5 (depending on shop). There are various shoe conversion charts online and very unhelpfully all of them seem to give different sizes - I...
You will find that a size 8 shoe will be marked as such if you are shopping for shoes in North America (Europe uses a different scale). I would describe it is slightly below the average male shoe...