Have you experienced lag and desynch issues with those other games? If not, they are worth checking out to me. More info on this would be appreciated.
One reason I've started checking out other games is to see how they resolve desynch. As explained in the creature desynch thread, if a command like a jump or swing takes 500 ms to travel from one player to the server to another player (even ignoring processing time), there is a 500 ms visual delay between players.
There are definitely ways to work around this delay. For example, some games will send a command from a client to the server, the server then sends it back to all nearby players. This system does a much better job of synchronizing actions between players, but can feel sluggish for the client initiating an action. I believe that Darkfall does something like this with their 'momentum' system as it felt to me that actions were delayed based on my ping (the delay was more noticeable to me when connecting to a EU server).