Just ran through the whole show in about a week. It's not as good as ATLA and there were definitely some shytty aspects in the story but this show was really good, and a worthy successor.
Season 1 was pretty good. Amon was a great villian, and I loved the way they introduced Republic City. The love triangle sucked and Korra was annoying at times but overall it was a great season.
Season 2 took a huge turn for the worst. I didn't care for too much in this season outside of Avatar Wan and Bolin's movie storyline. Unalaq was lame as fukk and the Southern Water Tribe just wasn't a very compelling setting. The final battle between Korra and Unalaq sucked too.
The show got back on track with season 3. The Red Lotus came through and crushed the buildings. Zaheer was a top notch villain and I was glad they finally did away with the love triangle. It was on par with season 1. I hated every second Kai was on screen tho.
Season 4 was straight piff, might be my favorite season. Kuvira was the shyt and when I saw Toph the Gawd
. I thought Kuvira should've just died tho. Her and Korra "connecting" in the end was unnecessary. I'm glad Su didn't accept her apology.
My favorite seasons prolly 1/4/3/2.
Most of the protagonists are pretty meh honestly. I don't like anyone on this show as much as i liked Aang, Toph or Sokka. Korra isn't a bad character but she isn't very likeable. She does alot of annoying shyt in the first two seasons. Thankfully she calmed down by season 3. Her character development was one of the best parts of this show. Mako was bland as fukk. Asami was ok, but hands down my favorite from Team Avatar is Bolin. My favorite non-villains were Bolin and Tenzin. Villains ranked Amon/Zaheer/Kuvira/Unalaq.
One thing I can say is that it seemed like the avatar state was neutered in this show. In ATLA, if Aang went into the Avatar state it was a wrap for whoever he was fighting. In this, she got beat a handful of times while in it, and it seemed like she went into it every other episode in season 2.
This show isn't anywhere near as funny as ATLA either. I lol'ed maybe 3 times in all 4 seasons, whereas I used to legit crack up atleast once every two episodes in ATLA. It's cool because the show was supposed to be more mature but it's definitely noticeably less funny.
Also, I'm cool with Korrasami, but I feel like it was rushed and random af. I knew it was coming, but I can't honestly say I saw any chemistry between them. They didn't even get cool until season 3, and it always just seemed like a friendship to me. I think the buildup to Korrasami was terrible, and it would've been better if Korra would've been single.
All that being said, this show was great. The Avatar series definitely one of the best TV series of all time, animated or live action. I'm just hoping they'll make more. I know there probably won't be another show, but I hope they could at least make a couple movies. This universe is so huge and there's a ton they could do with it in the future. It would be a real shame if they stopped making new Avatar material altogether.