I'm really not fond of her, I found it difficult to sympathize with her because Asuna's situation was ten times worse. I don't like her design (hate it, actually). I don't like how she has so much screentime in ALO. I don't like how she was a fanservice object. And with the way the series portrays her is ridiculous:
"Let's spend 14 episodes setting up how much Kirito and Asuna bond and fall in love, and
then bring in this new 'little sister' girl who likes Kirito too while Asuna in a coma while her avatar gets sexual abuse threats from a douche. Poor new girl! Her love is unrequited, isn't that sad?"
......you're
kidding, right!?
NO, I don't freaking CARE about her stupid crush, dammit!! 
I couldn't care less! Asuna's being tortured daily and you expect me to care about
Suguha's feelings?
NO, anime.
That doesn't work. It doesn't.
That being said, I DO love her seiyuu. And I like Lyfa. She acted more mature and level-headed as Lyfa. Lyfa's design is also much more interesting.