Can we talk about how the best romance in the series was fodder for the worst?
https://www.youtube.com/watch?v=yDcDCQpwaus
Korrasami is great for it's cultural/societal impact, but in terms of what actually seemed like the best match of personalities, nothing beats the comical Bolin's ability to add levity to Korra's overly self-serious attitude.
The fact that Korra never stopped being so mopey and angsty after season 1 is such a massive shame. She was never as likeable as Aang because we rarely ever got to see her have fun. If she had ended up with Bolin, you have to admit that she would've become more amicable simply by being in his presence.
I actually like Korra a lot more as a protagonist (over Aang). After my second viewing of TLA it really started to grate on me just how much of a flake Aang was. I understand of course that he was young and had a tremendous burden on him, but the sheer amount of times he spazed out over the course of the series got very old. Sometimes you just wanted to smack him and tell him to stop being so selfish or moody. Worse yet was that at least a third of the episodes were devoted to (if not Aang) the same exact one off premise where a character makes a small mistake that is immediately misinterpreted by the entire group, who all then go mental (when one line of dialogue would have cleared the issue up in the first place) until the predictable resolution.
I guess the height of Aangs selfishness was when he, y'know, hid the letter from Sokka and Kataara's father, and I know that said episode is debated by fans if it counts as being OOC or not, but it happened. Even if we ignored that, the fact that he essentially ran away on the eve of fighting the Fire Lord because he just couldn't reconcile the idea that he might have to kill Ozai took the cake. Essentially he was placing his own happiness and desires above that the lives of millions of people and his friends who had moved heaven and earth for him up to that point. Good thing the giant turtle gave him an out.
So when Korra did role around with a more serious attitude, relative maturity, and acceptance of her larger duty I found her refreshing. She has her obvious flaws just like Aang did but on a macro level she was always trying to act in the interest of others, of being the Avatar and helping people. We never saw her stooping to the same lows as Aang (only close contender being Mako but even then she did legitimately have a period where she accepted that Mako and Asami were a couple and was being friends with them). The only time she pulled an Aang was after season 3, and at least then she was still searching for a way to get herself back into action prior to giving up after years.
She did have fun moments, especially in seasons 1 and 3, but she was also going through a lot more than Aang just in terms of sheer weight and immediate threats and the volume of abuse heaped on her. TLA you of course had your threats per episode but they were framed as being interspersed between travels, which of course did give Aang and co more time to decompress and have fun. Korra basically went through the wringer. Season 2 where they made everyone a jerk aside, they even managed to have some fun with Korra's stubborn direct I-lack-social-skills personality, particularly when she was trying to convince that deadbeat kid to join the air benders and it devolved into her shouting 'YES YOU DO!' at him for the entire scene while getting angrier and angrier to the point where the gang had to separate them, it was a really fun scene. Aang felt the guilt of not wanting greater responsibility (while also of course feeling that he should help people), where as Korra always embraced it to the point that she couldn't understand how someone could not want to rise to the call as it were.
I do think that Bolin and Korra would have made a good couple, but Korra and Asami work well together in that they are opposites in many ways and thus compensate (and help one another to overcome) each others weaknesses. Bolin is a fun guy, but I think Korra's emotional upheaval throughout the series would have sunk that relationship sooner or later. Korra by the end is a far different person than she started out as, but even so I think the only person of the cast who would have been capable of navigating the waters of what Korra was going through (and when Korra was acting out) from seasons one on-wards would have been Asami. Mako is a dependable guy but he doesn't really have the emotional depth that Korra needs, and I think only Asami would have been able to put up with and find ways the circumvent Korra's (sometimes unintentionally selfish bullshit).
The only downside is that Asami basically let Korra walk all over her in the earlier seasons, even up until season 4, but at least by the end of Season 4 Korra seems to be in a much more self aware place.
I really enjoyed TLA and there are some things that it unquestionably does better than TLOK (consistency, overall themes, character arcs) but I wanted to strangle virtually every main character at one point or another in TLA, because a lot of the episodic 'conflicts' were so contrived that they damaged the credibility of the protagonists in question.