Patch incoming some time:
http://forums.ubi.com/showthread.php/892700-Watch-Dogs-Patch-(6-18-14)?p=10052409#post10052409
I hate the MP hosts story, wish they would have dedicated ubi servers, the lag has become terrible 
it’s ruining the experience. Was great a few weeks back, so I hope this patch will address some of those issues. Well to be fair, I was on my own, now with both of us trying to play together it’s a bit wonky.
MULTIPLAYER FIXES
• Fixed several minor respawn issues.
• Fixed some connection and session joining issues.
Thanks for the heads up TG.
Love this one:
• Fixed the issue preventing players from using hacks in game. (Double meaning … hahaha)