Perhaps it is fine with you, but it assumes broadband everywhere and perfect connectivity.
In Australia, I have a fast speed, but its ADSL and, while better then it used to be, it isn't reliable.
So if my ADSL goes down after I organize to have everyone over to play Starcraft II, we can no longer play. Its a stupid decision from misguided management types who don't realise, as someone said above, that soon after the release, the DRM will be cracked and the LAN support added. If Blizzard aren't going to look after their fans, they won't get any respect from them, and many will pirate the game out of spite.
I am happy to give Blizzard my money, I buy the commercial games that I play, but this decision will hurt Blizzard.