A champion with a decent enough early game , terrific wave clear 
, has a speed boost 
, a heal and an ultimate that literally fucks assassins, so she doesn't even need a support, and then come late game she melts everyone just like a hypercarry marksmen except when they diver her she just ults herself, so she doesn't have to worry about bad sups.
Quepha4 voteskayle has her weaknesses:
no dashes, her speed boost is a poor excuse for an escape or positioning tool and also has a hefty cooldown. medium-poor range auto attacks and her Q doesn't go much farther outside of that range. the nature of her auto damage means she can't achieve the regen of a lifesteal adc even when you count her heal. auto-pushes the lane making her vulnerable to ganks. her damage is very level-dependent which discourages her from having a support to cover her weaknesses.
Aimléss1 votesThere are plenty of ADCs that have no dashes/escapes and don't even get a speed boost. A lot of Adcs do outrange her, but since she has that ultiimate positioning isn't that huge of a deal. Once an ADC gets ruunans or statik shiv they auto push the lane as well, and they're all vulnerable to not only ganks but tower dives as well, since they don't have an ultimate that makes them invincible. And like I said she doesn't need a support nearly as much as other ADCs in the first place.
Quepha1 votesThere are plenty of ADCs that have no dashes/escapes and don't even get a speed boost. A lot of Adcs do outrange her, but since she has that ultiimate positioning isn't that huge of a deal. Once an ADC gets ruunans or statik shiv they auto push the lane as well, and they're all vulnerable to not only ganks but tower dives as well, since they don't have an ultimate that makes them invincible. And like I said she doesn't need a support nearly as much as other ADCs in the first place.
So her mobility not being tied for the literal worst among all marksman means it's good? That's flat-out wrong, she's still below average.
You think her ult lets her position anywhere she wants in a team fight? I hope you never end up on my team, you would definitely be useless as a carry more often than not.
Auto-pushing the lane is great one or two items in when the lane phase is over, but Kayle does it out of the starting gate whether she wants to or not. Being unable to maintain a freeze is something the enemy jungler can count on if they're intelligent.
Aimléss1 votesI'll never change your mind, you came to this thread to disagree and you'll leave that way, so I'll just end with every champ has weaknesses, the fact that she can viably go top (so she doesn't need a support at all really), but still gets to hyper carry late game just shows that she is still better than ADCs. Plain and simple. Don't even respond I won't be reading it.
Quepha1 votesI'll never change your mind, you came to this thread to disagree and you'll leave that way, so I'll just end with every champ has weaknesses, the fact that she can viably go top (so she doesn't need a support at all really), but still gets to hyper carry late game just shows that she is still better than ADCs. Plain and simple. Don't even respond I won't be reading it.
Wow someone better get the word out to the pro teams then, they all must be idiots for never touching Kayle and still using adcs in the bot lane!
BananaSlayerAMO2 votesIMO, one of the main roles of marksmen is to bring dmg to take team objectives like towers or dragon, which Kayle does not do as well as most others.
A little Peepo1 votesI'm not really sure what you are trying to say here? But are you saying kayle has everything an adc has and more? Sorry I'm just confused by title and post
Aimléss1 votesYeah that's what I'm trying to say.