I'm not going to even touch the issues with auto-updating/privacy concerns or even the CurseProfiler which isn't an optional installation component but rather made an optional component to uninstall (after is has been installed
). All of this has already been mentioned weeks ago, in the relevant WoWAce thread. Some things have changed for the better, some have stayed the same.
The main problem with the curse client is the fact that its matching system is pretty messed at the moment, which makes it pretty unreliable since there is no way of knowing whether the addon installed is actually a valid/updated version or some random addon with the same name that hasn't been updated since WoW 1.0, yet for some obscure reason, hasn't been nuked from the database. If you have to constantly check the integrity of your ..\Interface\Addons folder, keep compressed backups out of fear that X updater may ruin everything in the next update, then really, what's the point of using an updater. Better off just SVN checking out the addons you want, or doing it the traditional way through site downloads.