Its the fact that most of the fights we've seen usually has someone overpowering someone else in order to win. One thing I liked about the old series was that during the battles the protagonists and antagonists won through skill or trickery, not outright being powerhouses overpowering opponents to win battles, as that rarely ever happened but it seems to be the case with this show, which is also an issue I had with shows like Code Lyoko where the villain was a powerhouse on a completely unfair level than the heroes (an issue I've also had with most Japanese anime as well), which was hardly ever the case in Avatar the Last Airbenderwhich was one reason I enjoyed the first series and liked the fights so much but seems to be more or less how the fights between the protagonists and antagonists in this sequel series play out is through outright overpowering each other in fights (yeah I guess there are some fights with skill but there are so few of them).

I don't know there were several times when the characters in theoriginal series just plain beat the tar out of the enemies

One thing that bugs me is how much stuff we don't know that went on during the time skip. I mean Yakone was a known threat but you can't tell me Aang had been sitting around sipping latte's for 70 years there had to be some other stuff going on

I hope this isn't seen as off topic since it's not related to the OP's actual post, but it's a few things about the show that kind of bug me. (Not in a way that makes me dislike the show though)

Metal Benders. Ok, so as we all know, metal benders are earth benders that have learned to bend metal. The problem I have is that they very rarely seem to bend earth itself at all. It's as if they've focused overly much on the metal bending aspect of their abilities. I think I saw Lin do a slight bit of actual earth bending in the episode where they discover that Hiroshi is an Equalist, but that's it. We saw Toph continue to bend both metal and actual earth pretty regularly after she gained the ability to metal bend. Why would these earth benders not do the same? During the battle with Hiroshi and his robots you clearly see that the floor is still made of earth not platinum like the wall, and that could have been used to great advantage in that fight considering how many earth/metal benders went down there, but it's never done.

Earth benders in general. It doesn't really bug me too much, but in the original series you see earth benders commonly go without footwear, yet in LOK they are almost always wearing shoes. Yes I know Lin is an exception since she regularly makes the metal around her foot slide back so she can do her radar stomp.

Korra. For a water tribe girl who has supposedly mastered her native element along with earth and fire she sure seems to do an awful lot of fire bending when she fights (non tournament). You'd think that Katara at least would have taught her to keep some kind of water pouch around the way she did so she'd always have water to bend with. Heck you'd think Aang would have learned that as well so he always has plenty of options open when it comes to his bending needs.

Just my .02. I still enjoy the show, those are just things that kind of stick out to me.

For the sake of not having a giant reply... ;3

I guess they'll use earthbending when necessary [especially Bolin since he can't bend metal]. Bolin does put up an earth-shield, but that doesn't do much for him as the chi-blocker simply jumped over it...

I get what you mean. Lin can remove her shoes at will and feel the Earth, but as I said, it's probably because she's more attuned to the earth than other benders are then. I'm still thinking it has to do with footwear becoming more common when roaming city streets. I'm sure that if you came across a village of earthbenders, most might be barefoot.

Well, Katara is different, as you pointed out; she can ONLY bend water, whereas Korra can bend all of them. She does use a bit of water and earthbending, but when it comes to fights, she firebends more. I see it's more predominant when fighting hand-to-hand, because firebending in hand-to-hand combat seems more doable than water or earth. :L
Also, Katara was travelling with [basically] a wanted person. They were being hunted by the Fire Nation, there was bound to be loads of encounters with enemies, hence, the water becoming necessary. Korra, technically, isn't being hunted. Or at least, wasn't at first.
I think it's fine how it is. It may seems she firebends a lot, but she does use the other two as well, if they're available.

I was wondering why didn't katara teach Korra how to take water from the air. Being more experieced that move must have become much more powerful and it would be useful in areas that had little water

In theory the Avatar should have the potential to learn every bending form. In theory Korra could learn blood bending or use lightning or metal bend the same as other benders. I think it is up to the indivdual to learn and master it though like any other skill. Personally I think Aang could have learned metalbending from Toph if he wanted to. He even learned how to see with the earth like Toph, so I see no reason for him not to be able to metal bend.

Maybe Korra will learning advanced forms or refine her skills.

I think that water bending move which takes water from the air and the surroundings is a dangerous move (Remember how the flower withered?). So I don't think Katara would teach it.

Also there's this one thing that bugs me about the Lightning Bending. In TLA, Zuko had a tough time trying to lightning bend and only the best fire benders could do it. However in LoK, I find it really strange that quite a lot of the fire benders know Lightning bending, for example : Mako, Lightning Bolt Zolt and others at the factory mako worked at. Lightning Bending is extremely dangerous so I can't see how it can become an average skill unless everyone decided it would be safe to teach such a harmful skill. (I guess electrocution is not very harmful in KoL, considering that most of the Equalists now have those "Iron Man" lightning gloves.)

my question is why didnt aang learn how to bloodbend? why are katara, yakone the old coot, tarrlok and possibly amon the only bloodbenders? aang shouldve at least learned so he could counter it like katara did. sure its illegal but hes the avatar so he shouldve mastered it. meh whatever