Revised final mini reviews of all 3 DLC:
Crown of the Sunken King: haunting and maze-like. Smart enemy placement and tons of secrets. Bring plenty of arrows. Only downside is that all 3 boss battles are made of re-used assets but they're different enough. Nashandra 2.0 is kinda' cheap and depends on what she summons. 9/10
Crown of the Ivory King: implements a new gimmick requiring you to destroy idols in order to get a boss soul, and make the final boss fight much easier. Enemy placement is much more haphazard and favors ambushes and gauntlets. Two bosses are made of re-used assets and one of them is flagrantly almost the same exact fight, but on the plus side he's optional. The other boss fights are fantastic but everything leading up to them is just more of the same; gauntlets and ambushes. 5/10. If it weren't for the Fume and Alone Knight bosses I would honestly give this a 2/10.
Crown of the Ivory King: huge change in scenery and retains the maze-like gameplay of the 1st DLC. Smart enemy placement, some new varieties of enemies, with an emphasis on re-visiting areas once-thought completed unearthing more content. Only 1 boss is a re-used asset but it's tied to lore and Demons Souls fans will get a kick out of it. Also introduces a new gimmick for handling one particular gauntlet. Only downside is the optional boss (which ends up being more of the same) and some very cheap enemy placement in that particular zone. But the stage is so incredibly unique for the Souls franchise that it's worth playing. 8/10