The most important reason to max W is for waveclear. If you max Q or E, then I'm going to shove you into your tower for the entire lane. I will make sure you can never roam, and I'll make it much harder for you to farm. If you can't just outright kill me, you're going to lose a ton of opportunities to roam and get kills unless you give up all your farm to do it. Not having the W maxed out also majorly hurts your mobility. You become much more reliant on having to kill someone in one burst combo and having no enemies nearby to punish you for doing it. With the W maxed, your cooldown is low enough that you can actually use the W to fight AND stay alive.
LeBlanc used to suck hard and be considered a troll pick until Riot rebalanced her so she could max W. That's how important it is to her. Waveclear is one of the most important things you can have as a midlaner, and if you don't have it, you will be exploited.
The E max sucks because it gives you almost nothing and forces you into having most of your damage in a very unreliable skill. The CC doesn't increase, the damage doesn't increase by any more than the Q max. On top of that, you can miss the E, and people can break out of it to avoid half of the damage. It's a terrible skill to rely on because it gives your opponent too much of an opportunity to respond.
Also, i should note that when you said "-1.00 AP Ratio -Good CC", neither of those are relevant. Neither of these change with extra E points, so they don't matter at all for the discussion of what to max first. It will still have both of these traits even when unmaxed.
The Q max is bad because in addition to letting you get pushed in, it also lowers the reliability of your damage by forcing you to use another spell to activate it. That means either trying to hit a long-range E, or putting your W or ult on a long and punishable CD just to proc the damage. The W gets all of its damage upfront, which is extremely beneficial for keeping your options open. That actually makes it more mana-efficient too, because a W max only has to cast W to hurt somoene, while the Q max won't do good damage unless they use another skill that won't have any points in it. That's a lot of mana to waste.
