Well, I've been playing all day today, and all I have to say is wow.
The Rikti Mothership raid was tons of fun. The wave after wave of Elite Bosses made it chaotic and epic all at the same time, and the constant threat of the shield going up again if the bombs weren't placed in time kept me on edge. Plus Uk'on Gr'ai was a great raid boss encounter.
The new missions are innovative and loads of fun, deviating a bit from standard CoV mission formulas. Although I only did the first 3 missions of Borea's story arc, I'm really looking forward to all the new missions RWZ's contacts have to offer.
The Rikti raids in the various hero and villain zones are interesting, but nothing phenomenal. Visually it looks awesome, and fighting hordes of Rikti is fun, but the constant Red Admin warnings in chat get annoying after a while, and fighting Rikti out doors gets repetitive eventually.
The last thing I did was the Rikti Strike Force. Although a bit on the easy side, it was still a lot of fun, and there were a lot of innovative bosses and level designs inside. Plus the story twist at the end is well worth running it.
Overall, a great issue. I can't wait to get on again tomorrow and continue with the story arcs, and running a few more Mothership raids to help get merits for my Vanguard heavy.