i have to say - season 3 was probably the best recovery season ive seen for any show ever, s1 and 2 were good, but had some serious missteps. season 3 was all around excellence and 4 looks like it'll keep the bar high.

so sad this will more than likely be the last we'll see of avatar for the next 5 or so years at least

Just watched it. I'll echo JID in saying I can hardly believe how well this show has recovered.

Season 1 started really strong and then spent entirely too much time on pro-bending and love triangles for my taste. Amon and the Equalists were really cool and threatening to begin with, and I mostly like how they were handled, but the ending felt very rushed and there was definitely an opportunity missed in giving Korra and everyone else their bending back so quickly. Korra only being able to air bend for at least the first few episodes of Season 2 would have been good for the character and given the very disconnected, basically forgotten events of Season 1 some much needed consequences. Exactly like what they did with the spirits in Seasons 2 and 3, incidentally.

Season 2 was an improvement in some ways, although my favourable opinion of it is greatly slanted by the excellent Wan episodes and the conscious decision to portray events with lasting consequences.

But Season 3 really improved things, and I enjoyed the positive forward thrust of getting the Air Nomads back instead of just reacting to some villain – which was there as well, with some great villains with believable motivations and subtle ties to the somewhat cursory at the time guru/chakra stuff from ATLA. And then there was the sideplot about Lin and her sister thankfully taking precedence over further teen romance storylines.

The first two seasons were enjoyable despite my quibbles, but I can't really think of any quibbles about Season 3 besides the excessively minor one of how characters kept repeating "taken out" to mean "killed" (not really sure why, but it just got on my nerves – especially since the show has used the words "kill" and "die" but only when the character in question is not actually dead – see Korra's father).

I'm not going to pass any pre-judgements on Season 4, but it really does look promising one episode in, and I'm very hopeful considering how well the last season went.

TVY7. Depending on Nick's S&P department, they may have a limited number of "kill"s per season.

OK, so I just bullrushed all of S3 and watched the S4 premiere. I am really impressed by the actual consequences at the end of S3 (compare to the end of S1, for instance), and also TONY STARK BUILT HIS MAGLEV TRAIN!