Why?
How?
How could you like a character who's so hopeless and indecisive she can only act after she gets (deservedly) beaten down.
What is even remotely likeable about her?
From "I can't watch you do this Arthas but I sure as hell aren't going to stop you because that would involve a bit of effort" to "I'M SO MAD I'M GOING TO DROWN ORGRIMMAR OH PLEASE HOLD ME TENDERLY MY DRAGON BOYFRIEND" there is nothing redeemable about Jaina's character.
It's not even like she had interesting development to get to where she was. Like most Alliance characters she's only relevant because her daddy was a big name.
I'm so glad she got the boot out of Dalaran, if I had to run around and answer to her for a full expansion I'd be rooting for the Legion.