I think those cloned rides from DCA get a "pass" at DisneySea because so few people have ever been to see them. Or they see the pictures of all that fake seaweed and decide because the purchase orders were approved by Oriental Land Company accountants that the rides must somehow be superior. They aren't. They are clones from DCA. Still cute though.
What's funny is that A Bug's Land at DCA gets any hate at all. It's a little land that's cleverly themed and nicely crafted, with four cute little family rides in it, plus a very good 3D show with It's Tough To Be A Bug (that's gone sparklingly digital and is much better maintained than the DAK version). And it has lots of shade from the California sun, and plenty of benches made out of popsicle sticks.
DCA has 21 rides in the park total. A Bug's Land has 4 of those 21 DCA rides. DHS has 6 rides in the park total. DAK has 7 rides in the park total.
DHS and DAK desperately need rides added, and not all of them can be mega E Tickets with 46 inch height requirements. DHS and DAK, and to a lesser extent Epcot and Magic Kingdom, would be helped immensely if they had A Bug's Land or Mermaid Lagoon area added with these four cute little family rides in them. It would help fill in the threadbare tapestry of missing attractions for the WDW parks.
But if folks want to sniff that A Bug's Land or Mermaid Lagoon are dumbed down additions with cheesy kiddy rides, then so be it. But both A Bug's Land and Mermaid Lagoon are found in parks bursting at the seams with rides and attractions that most WDW parks would kill to have for their guests.
FULL DISCLOSURE: I enjoy Aquatopia, and ride it on every Tokyo visit.