My sister has 5GB Bigpond NextG (shaped, fortunately) (NextG is her only internet option). My nephew plays Guild Wars all the time. It's completely playable.
They use somewhere between 2GB & 3GB most months between Guld Wars, Skype and general web browsing, email, etc.
The thing to be careful of is not downloading the whole game. In case your DAT gets corrupted, periodically make a copy of it after playing (and do a -image when you're not on wireless). Then if something happens you can just copy back your saved version and only have to download the changes since then.
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