As the title asks, what is actually useful in this expansion for online multiplayer.  Please be specific for the following typical online conditions:

1v1:

FFA (locked teams):

XvX (where X is 2-5):

These are the most typical scenarios, also in the past, pirates inactive was a standard setting for most online games.  With the myriad of pirate changes are they typically turned on for anyone's games?

So far, personally, I've gotten the feeling that this expansion creates more problems than it solves for online players.  First and foremost it has split the lobby yet again (it'd be nice if we could a least tell which players are using which version).  It also seems a lot more prone to minidumps, desynchs, and slower performance in general.  So far I've yet to see a use for any of the new stuff though I've only done 1v1's and FFAs.