If you haven't heard by now, RoT is DST's most recant update chain. Most people dislike most of the content (I being one of them) but there's some good stuff in it too.
The good:
The Lunar Island concept.
The concept of sea shadow creatures (originally SW exclusive), Wavey Jones in particular.
The Leafy Meat dishes.
The Clean Sweeper.
The cookbook feature.
The bad:
The RoT boat system (more on that Here).
The Hermit Island and the Crabby Hermit.
The Crab King and the Malbatross (they're just not well designed).
The arbitrarily different sea contents.
The way they did the RoT map edge.
The Underwater Salvageables and the Pinchin' Winch.
Let me know if I missed anything and as always let me know what you think down below.