While Shangai Dragons haven't won a single game yet I think Dallas Fuel may be the worst team given the morale and communication issues.
Shangai may want to try to at least win its first game and just not be worst team in the league but people had higher expectations of Dallas Fuel, expectations which I think the team don't believe they can achieve anymore so why bother?
Let me put that way, Shangai is a featherweight who is at least trying while Dallas is a heavyweight who stopped giving a shit. For now Dallas can still bully Shangai but eventually Shangai may find it's way.
To close, take anything I said with a grain of salt, if e-sports are anything like real life sports chances are everybody opinion about anything is full of shit. :)