At this time, there are still issues with the WWE Network. The live stream seems to be working fine for almost everyone, but several have reported issues with the OnDemand content. Word is that there are major loading issues for some, and that the content isn’t playing at all for others.
People have also reported issues with logging in on the Playstation 4.
MLBAM has noted that that they have not seen anything like this, in regards to such high demand of one specific Network, in their 14 years of doing e-commerce.