Just looking through the entries, I was awe struck by the vast different array of presentational styles and ideas, that people judging the competition may have to deal with. There are indeed some very strong architectural concepts used there to design memorials of such scale. But the mere fact, that each entry is bar-coded just speaks for itself, in terms of how many entries there must have been!
Problem with gardens of remembrance like here in Dublin, is you get left with them years and years later, when they mean much less to people alive. Perhaps a new competition should actually be held to make some other kind of fitting remembrance to replace the Parnell Square monument, freeing up that site for some other usage? Even just glancing through a lot of these entries for the WTC competition myself, I don't envy the job of ajudicators who run these competitions - a major amount of concentration must be necessary to stay focussed on the job and give each entry some time.