I am playing D3 on a Guest Pass, and so far have really enjoyed the experience.
However, I lag. HUGE lag between anything I do and its execution. Sometimes it doesn't lag, and those moments are just so precious, it doubles the fun.
Now, let's say Blizzard irons out the server issues in a week or two. BUT, since the game is technically ONLINE all the bloody time, the single player will lag if I start a download? If so, D3 is a no purchase for me. I cannot play the game on my home PC because my family are on downloads all the time. Same at office.
This is just so incredibly stupid.