1: While his E bounces through the minion wave, it takes 2-3 casts for it to actually reach them all (usually). Even if the E hits you, it doesn't do much damage on its own, and you just need to watch out for his Q or W until the mark expires (which isn't very long).
2: His Q came completely off cd from casting his other spells before this rework too. It also reduced the cd on his other spells by the cd on his Q. His combo is far more easily controlled by Riot now. This will also make it easier for them to fine tune his strength without turning him super weak or into a monster.
3: He's no tankier than he was before (actually probably squishier with the loss of his spellvamp).
4: He does have combos that wok for various situations.
4.1: Q -> E -> Q (empowered) -> W -> Q -> E ->Q (empowered) is his max damage combo
4.2: (Q) -> E -> W (empowered) -> Q (shield/ms) is his escape/cc combo. The E empowered W snares for longer, and the Q cast gives the shield and movespeed boost.
4.3: (Q) -> E -> wait -> W (empowered) -> Q (shield/ms) -> E -> Q (empowered) would be his ideal gank combo.
Weaknesses:
4.1: Only 1 sec of snare for the entire combo. If you can dodge his Qs, he'll do very little damage with this combo.
4.2: Far less damage (no empowered Q and only max of 2 Qs)
4.3: No real weakness if it lands, but it is very telegraphed. When marked with his E, just try to stay back until the mark fades.
I'm sure there are more combos, but he generally has to sacrifice cc for damage or vice versa.
If he is a bit strong, they'll be able to adjust his power fairly easily at least.