Top Critic Average
If you enjoyed the main game and have an itch to come back, I recommend picking up Eight Princes if you were aiming to do another playthrough. If you are waiting for something different and novel to come along and really shake up Three Kingdoms, then I would say hold on to your dynasty hat for the time being.
Total War: Three Kingdoms - Eight Princes feels familiar, although, sadly, also a repeat of what you've already gone through in the past. While you can choose from eight princes, your overall experience (especially if you've put in hundreds of hours into the base game) would be more like a solid "7" instead.