I don't think its necessary to send Ayu any criticism at this point, they still have the final show to do tomorrow which will probably be better than today's show. Plus I personally just don't see the point, Ayu has always done what she wants to do, I don't think that will change if she gets a few tweets telling her (respectively) that her show wasn't up to scratch.
I can understand people being disappointed, especially those of you who paid to see her and have been left with a bitter taste. I don't know, I just wouldn't feel right telling Ayu that something she's worked on was unsatisfactory to me. But that's just me.
I actually prefer CDL concerts to Arena Tours, so hearing all the negative feedback is pretty depressing for me.