I personally had countless issues ordering the Nexus One on Tuesday and Wednesday as a current T-Mobile customer with the G1. However, the error I kept receiving was on T-Mobile's side. "T-Mobile's servers are busy/non-responsive" something like that...
I ordered it Thursday around Noon CST with custom engraving and received free overnight shipping with no problems whatsoever. I received an email saying the device had shipped 90 minutes later.
Phone arrived yesterday. Charged it. Plugged in Google Account credentials and have had ZERO problems. Currently uploading/syncing a ton of pics I have taken with the Nexus One to my Picasa account, while transferring a 320kbps MP3 file via Bluetooth, with Pandora playing...with not a single hiccup.
In my opinion, one can expect someone to receive LOADS of negative press when they attempt to do something no one else has done, namely, sell smart/super phones directly to the consumer over the web. I think the only thing Google forget was to put the "Beta" badge somewhere on the ordering site...