I've played the new beta a lot this last weekend including a 5v5! so I will note my observations about existing bugs etc...
1.) Connection issues still are quite abundant. Getting into the lobby is as easy as connecting to the host, so this is an improvement. However once in the lobby things are still pretty much the same. The biggest problem I see is that when people all connect at the same time to a lobby nobody can connect to each other and it never works. I also noticed by closing all open slots except one and forcing people to join one at time greatly increases the chance of being able to connect and play... of course this also dramatically increases the time spent in the lobby. It really seems like your best chance of success is playing with people who forward their ports.
2.) There is another lobby bug where if too many people have left/been booted, the newly created 'empty' slot now becomes a secret hidden 'full' slot and the host needs to remake the lobby to fix it. This is quite annoying considering how long it can take to connect everyone up in a lobby.
3.) Another huge character bug is with Sedna's heal. It seems to work about 50% of the time when trying to cast it on another player. It works fine for self cast, but God forbid if you try healing a teammate.
4.) Favor points are obviously still an issue. I had a few matches that didn't count my favor points and some matches I received double. My buddy sitting next to me was receiving about 2000 favor points per game. On Saturday I was one of those who had 250 million favor points, and now on Sunday I had less than 500.
5.) Alt-tab is still very risky for crashing the game, you have about a 20% change of crash on an alt-tab.
Some small features worth adding quickly:
1.) Add a vote kick feature to the game. We spent 15 minutes setting a 4v4 only to get in and find out some jackass has -3 sim speed. The game was virtually unplayable lag spiking about every 3 seconds. He finally ended up leaving after experiencing some unfriendly verbal abuse from the other players... (even on his own team).
2.) Perhaps add a lobby queue so people can't join at the same time. Have a little number on the screen saying you are "5th in queue to join this lobby" and then automate the process. I can't tell you enough how people connecting one at a time improve the connection rate ten fold. The 1 minute of time it would take to queue a lobby of 10 people is a lot less than screwing around in the lobby for 15 minutes kicking people, making them re-join, opening/closing slots, remaking the lobby etc...
Either way things are still getting a bit better and I'm still optimistic that the connection problem will be resolved. This game is too damn good tofail 
