Lets talk Kayle

So when I first started on the fields the first champ I picked up was Kayle, and she carried me most the way to 30. Since then however I have slowly stopped playing her. This is because, while she fills many (possibly all) of the roles, she doesn't do any of them overly well. I would like to have some discussion on some minor tweaks that could potentially give her some character definition or at least point out some of her major flaws.

To start I would like to point out that yes she can do any role;

• Top, she has poke and sustain,
• Mid she scales on AP and can poke/wave clear decently,
• Support she has sustain and some minor buffs that help the ADC,
• ADC she has range on her W,
• Jungle she has camp clear and can sustain plus she has some minor gankability.

That being said she doesn't do any of those jobs well enough to actually be considered highly for doing them. Her scaling isn't high enough for her to do burst damage, her sustain isn't high enough for her to do sustained damage, her poke isn't high enough for her to trade easily, and her move speed/attack speed are all low enough that you can only really focus on one or the other unless you want to get rid of some of her all important damage stats. So where can there be improvements to make her more viable (not op).