The reason that I say the arcade games are terrible is that people online make content every single day that rivals those games. People would kill to have their own personal content on something as massive as a PS3 console. If they aren't willing to put the effort into the games then release a tool set and let people create the games for you. They could end up with some awesome epic games that don't cost them a dime. They could specify what type of game they are looking for from week to week and they would have thousands of responses. They could have the best damned arcade system out there with thousands of games in it. But no, they give us this...
Oh and btw does the microphone come seperate or with the PS3? Oh and tell me, is there any patterns you are noticing as to who is playing in the Home beta from the voice chat?
Ok just read your edit so
EDIT
The personal rooms is a very nice touch. If you can make a video of how that works it would be nice, but even if it's well done, I don't think it will be mass adopted. Who knows.