Some of the plots was never meant to be solved in the first place (according to RJ notes), second, some plots were going to be solved in a sequel RJ planned (sequels are not going to be published) so were naturally left out, third (my opinion) the material was too huge to squeeze in a 3 books...
He is not RJ but he did good job. I think none other than RJ could have done it better. There are flaws of course but nothing major for me. I am happy for the last books but not every one is which is understandable.
The most important point for me is that I heard about him because of this...
Welcome to the site! I'm also senior-member what comes to age, 39 that is...
It's nice to have kind of a newbie wot fan :) most of us has read and re-read the books back and forth several times :)
The book discussion forums are stuctured so that you won't get spoiled unless you want to :)