If last week's episode was Mako's moment to shine, "Long Live the Queen" was all about Asami. Okay, maybe not ALL about Asami, but she was certainly the most useful member of Team Avatar by far. The episode starts with Captain Hook and his men loading the Avatar into
the Jolly Roger an airship as Korra makes one last desperate attempt to convince them this is a huge mistake. She used the words "terrorists," "crazy," and "spirit world," so it's no wonder the Captain felt even more relieved they had tied her up.
Asami also gets chained but instead of the railing on the floor that will disappear in the next frames she chooses the one by the wall and quickly breaks out in her first useful moment of the episode (please, start counting). The second one comes when she frees Korra from her bindings after she uses their safe word. I'll leave you with that image. In the meantime, our last-stand heroes, Mako and Bolin, are being transported to Ba Sing Se so Bolin gets a chance to bond with the dream team much to Mako's disapproval.

Hey, at least now we know there's something going on between Ghazan and Ming-Hua. The trip's cut short and so is Bolin's interrogation as Zaheer presents the pair to the Queen and makes her an offer: trade the air benders for Korra. The Queen accepts and sends our heroes to the dungeons.
Back to Korra, Asami, and Captain Hook. Once Korra's free she kicks some butt and crashes the ship in the process.

She wouldn't be Korra otherwise. What surprised me somewhat is that Korra is still less confrontative than I had imagined she would be. She apologizes to the Captain and his crew, insists she's not going back with them, but suggests they should try and repair the ship, particularly with that sand demon roaming about. And by "they," we're talking about none other than Asami and reason #3:

So while Asami's doing something useful, Mako and Bolin are stuck in jail, with the former encouraging the latter to metal-bend them out of there. It's "Bolin time" again and we all know what that means... he's gonna fail. At this point, it's inevitable that the writers are setting us up with Bolin so that when he does do something incredible it'll take us by surprise (only it won't), and that something is bound to be Bolin learning to lava-bend somehow. I mean, we all know he's not metalbending any time soon...

If only, Bolin, if only. We're then introduced to our third side-story of the day and that's Lin's tracking of Korra. It's a pity Lin didn't have a lot to do in this episode, however, besides giving treats to Naga and Pabu.

At least she also confirmed Tonraq's back in the game (as is Zuko). Unfortunately, after all of Asami's hard work, the airship gets torn in half by our sand demon who promptly returns to patrol the sands leaving our merry gang to show off again by building a sand sled. Do I really need to say who came up with that idea? Of course not, I know that you know that I know that you know that it was Asami, and the fans were ecstatic because now they had the ultimate shipping proof:

Back in Ba Sing Se, Zaheer learns that the Queen has lost Korra what prompts our dream team to change tracks. Just as well because the Queen's also fed up with them and orders the stormtroopers Dai Li to follow in the footstep of their White Lotus and metal-bending counterparts. In other words, the fearless foursome make short work of the guards in a display of power that was bound to take even the Queen's breath away.

Oh, right, that was Zaheer. Personally, I didn't find it surprising and it was very much in character with Zaheer's personality. After all, if benders can alter the phase of matter such as water to ice or rock to lava, taking the air from a person's lungs shouldn't be that difficult at all, it's just something no air nomad would ever consider doing given their pacifistic views and training. Zaheer has no such constraints and has openly admitted his dislike of authority figures like President Raiko and the Earth Queen. What I continue to find slightly perturbing is that the writers may be backing themselves into a corner by making the dream team so overpowered that they'll have to pull an Aang or Jinora in order to recapture them (if this season doesn't outright end with a cliffhanger, which isn't such a stretch to imagine).
The episode ends with Zaheer announcing ala Bane that Ba Sing Se has been returned to the people, while Ghazan tears down the wall to the innermost district with lava, and Korra learning the news as she meets up with Tonraq, Lin, and Zuko. We could not have asked for a better team to storm Ba Sing Se and face Zaheer and his cohort, except maybe Toph.
What did I think of the episode then? Well, it's not bad but I was hoping for more. I think the setup was great to feature Asami and Korra having a chat to ponder the meaning of Zaheer's words while they were stranded in the desert. Is there truth to what he said? What is his ultimate goal? How can we stop him? Team Avatar has been on the go from day one but they haven't stopped to consider what they're up against and it's high time that they did. In fact, I expect them to do so even more now that they have direct access to the people who captured them in the first place: Tonraq, Zuko, and maybe even Lin. Zaheer's bound to be setting up a trap in Ba Sing Se so, for once, I'd like Korra to be prepared.
The clock's ticking down on Book Three and I fear (and hope) we're no closer to knowing the Red Lotus' agenda, even after Zaheer's chat with Korra, not to mention we've completely ditched the storyline about the spirits back in Republic City (and it's been a while since we last saw Tenzin and his army-in-training). Can the writers tie it all together in three episodes or will Book Three end in a cliffhanger?
Random thoughts

To be fair, you weren't much of one in Book Two and the writers seem to be painfully aware of that.

Tumblr's been hard at work drawing parallels between Korra and Shingeki no Kyojin (more here). I don't see it but I like the art work.
Ba Sing Se is conveniently left with no authority figure. If Suyin steps in, I'll be highly suspicious.