Since no one else has posted in a while...
Finished season two a couple of days ago. I could list out all the reasons that I really don't like it, but that would put a lot of effort into something that I don't really care about. A few thoughts/ramblings: Buumi was SUCH a disappointment. I was expecting so much more from the legendary military leader, but instead we got a clumsy fool who shows no wisdom that should come from war. The spirit world was weird, don't disgrace Iroh by trying to replicate him; I enjoyed Schow's cameo though! Original Avatar's story was cool and I liked it, but it just felt to storming convenient to the season, and pretty much all the magic rules from ATLA seem to have gone missing, so I guess the creators had to make up some new chull dung to justify Korra turning giant.
So... yeah. Season two was a bust. I probably would have stopped here if I hadn't heard from so many people that season three is the best season of the show. I'm looking forward to watching it!