Hopefully you see the irony in your post....ie class system causes people to quit because it built for casual player....Zodiac causes people to quit because takes too much time for the casual player.
in reality of course this may be the case for some people.....because you can never please everyone. Just the facts. A year in they seem to have a very healthy active playerbase. I would say one of the most successful mmo launches in past several years in terms of paying playerbase. Playerd quitting is all part of it.
There are a number of things I dont like. When there is enough I dont like about the game that it is not enjoyable then I will stop playing. It wont mean the game sucks or is a failure it will just mean it not the right game for me anymore. So far I see no signs of that.