These very Concepts really bother me that i nearly gave up on entire brand of the show!
1. Uncle Iroh is still "alive" within the spirits world! somehow....just WTF?!!
2. The Spirit world isn't Spiritual. It's a realm that you can physically go to. A place that you can Literally touch, feel, smell, hear, ect.
3. Dead people can go to the spirit world if they choose to which violates the concept of death.
4. Somehow the spirits can interact with the physical world.
5. Uncle iroh already knows korra even when he shouldn't cause he died way before she was born!
6. Spirit Portals! just bullshit writing! stupid spirit portals!
7. Korra recovery from mercury toxic poison which should of left permanent damage on your body but mainly in her fatty tissues and her brain. She SHOULD of been shown to have mental disorder, partial blindness and kidney failure. BUT NOOOOO!!!!!!
8. raava/vaatu is just a copy & paste character of Tui/La.
well guess these were the ones that ruined the show for me. just me but idk if anyone else agrees.