I actually like Korra more than Aang in some ways, she's not as passive and doesn't try so hard to avoid fights.
Obviously she's not in the same situation as Aang since there's no war to stop, but I still think she's an interesting character. If I have any issue with LoK it's that the villains just aren't as interesting as they were in the original. Amon and Unalaq can't compare to Ozai/Azula/Early Zuko/Zhao/etc.
Amon started out cool but the reveal of his identity was completely anticlimactic and his backstory was .
Unalaq was just a generic evil character with no believable motive.
Hopefully the Season 3 villains are interesting. If nothing else Zuko is showing up this season so that's something to look forward to.
IMO I think she needs more character development or there just needs to be a better antagonist to push her. Again this is just my opinion. The show needs a bigger threat; in the original Avatar show the fire nation was the biggest threat that they wiped a whole people. The show needs a threat like that.