I'm gonna have to go with Lexy on this one guys.

The major details I remember about lightning:
-Her service in the military constantly gives her the opportunity to tell the others just how insanely difficult it'll be to take on Cocoon. (Just like how Cloud would brag about SOLDIER)
-Her intense, and somewhat misplaced hatred for Snow. (I get it, Snow can be a bit of a dumbass, it's not like you could put your differences aside long enough to solve the more immediate problem. Like, say, the entire government wanting them dead (that's also my problem with Hope. Seriously guys, I know he needs a scapegoat, but "Operation Nora" could have been executed at a better time.)
-Her sudden epiphany that's supposed to win her automatic sympathy, and apparently also resolves her conflict with Snow.

I'm not saying that she's the worst character in the series though. I personally can't connect with her. AT ALL. I can connect with Sazh, Snow, even with Hope (who I hated with a burning passion), but Lightning's only action that made sense to me was ironically enough, her wanting to charge Cocoon, and destroy all the fal'Cie, just so she felt like she was still in control of her life.