A visitor needs to understand that at this time all you will see and do is look at the two fountains which are where the two towers were (which is highly impressive and a great monument) and read the names of the victims, very moving and somber. There is also the "survivor tree", a tree from the original site. And then there are the grounds which have benches and new landscape.
I agree with others that this is highly disorganized and noisy. We walked straight to the memorial site from the subway, following the signs we saw all along the streets which directed us to the site. Once we got to the site we were told we needed to go about 8 blocks to get the free tickets (what?). The streets are very crowded and there are obnoxious people who try to sell "programs" all over. After getting the tickets we went back to the line. Our tickets were scanned and we got in line for security. In that line our tickets were once more checked. After security you walk outside along concrete barricades almost through a maze. Right before you enter that your ticket is marked with a red marker. WHy you have to have your pass checked three times is ridiculous. WHen you get the tickets (8 blocks away) you don't show an ID so it is not like the ticket identifies you.
Many of the security personnel and employees were rude as well (I'm originally from New Jersey and am well aware of New York and its perception that all are rude, but this was ridiculous. These people were the rudest people I have encountered this entire trip). It is really sad what attitude these people had.
Once inside the memorial it is fairly solemn, I did not encounter loud or inappropriate behavior. Due to all the construction it is loud though.
If you will be back in New York once the museum is open and all the entrances are settled, I would wait. If this is your only chance to see the Memorial and it is truly something you want to do then do it.
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