I don't think you can be angry at people for going in solo, as mentioned before the event was designed for parties (both full and low man) or solo, trusts were shown in the original pictures. Your complaint is you are on a very populated server and not enough instances exist for everyone to use.

Ambuscade has always been busy for the first weekend on Asura, it usually dies down when the events start (around the second week, but they started early this month).

It is not disgusting in any way, people pay the money and are playing by the rules. If you want to get angry, be angry about the number of zones