Asus MeMo tablet

On Saturday I picked up the MeMo tablet I had ordered from Tesco. I charged it up and on Sunday gave it to Lynn for her birthday present.  When we realised that it was either not functioning properly, or that we simply didn't know how to get past the initial problem of not have a screen menu visible, we decided to take it back.  I was amazed at how many owners of this tablet were having problems with it.  Does this mean that many of these tablets are sent out faulty?  Or is the software so impenetrable that normal people can't dig through it?  Anyway, it's gone, and is to be replaced by a food processor!