Lulue Top (and other ranged champs)
First things first: Ranged champs aren't exactly fair against top. A lot of top laners are late-game champs and have no choice but to lose trades if the enemy is ranged. That being said, some marksmen who don't scale well enough early to go bot can dominate top over the simple fact they have a blind and range.
Second,
Q should deal damage like Caitlin's. Sure, it's not so heavy-hitting in bot lane since she starts with a support item, but even a little AP and the chance to focus IT instead of her more supporty stuff, she's got a piercing shot that isn't mitigated by minions.
Meanwhile, the new Ryze (Yeah, go ahead and check my match history, I'm pretty upset the changes took away his Q harass against ranged opponents) now has a Q that has no CC (as always) and doesn't pass through minions, with a large hitbox. Arguable, a big hitbox is good. If Nid's changes showed us anything though, it simply means minions are less eager to get shot in the face. In this case, it means it's even harder to land the shot if your enemy isn't afk or scratching their balls with the mouse.
I've had issues fighting Lulu top before, as the only top laners who can really stand a chance against her with equal skill are the ones that are:
A) Marksmen who go top anyway.
or
B) Overpowered against their own melee counterparts.
I'd compare going LuLu top to going Teemo top. Lots of Magic damage, so no chance to defend that with your starter item (Armor's possible, but MR isn't, for some reason). But with the added benefit of having a big HP increase, shield, hard CC, and penetrating skillshot with two options for fire angle. Add that all up and unless you're Zed, you aren't getting any farm, unless you're Kassadin, you're eating a bunch of painful pixiedust to the face, and unless you're Riven, you're not killing her.
I understand that this isn't a always problem in a draft pick. The problem is, most players do not play with a draft pick. Realistically, a slight change to the damage condition, but not the slow, on her Q doesn't affect her support role at all. All it would do is let champions already at a massive range disadvantage have a shot at living, assuming they get away from the slow before her basics kill them.