Diana is as op in solo/normals as any other generic assasin.
Refreshing E in teamfights isn't the point, 14 seconds are a real pain in the lane.
With the changes to Q you can't harras people from afar as much as you could before. Basically, you're forced to go all-in QEW to do damage to your opponent now, which does hit people quite hard, but you become a lot more vulnerable to ganks during these 14 seconds and the early W speed boost is not that much.
Basically all the same as before but the time window increased dramatically during early-mid just to justify the constant 20% reduction.
Add the fact that nerfing her ult hits her early-mid game too, which is the time most fights are 6 people at max and baiting out cc/self displacement abilities is easier and you actually could pull the full ult before, the fact becomes clear: Katarina became weaker early-mid game. Which is the exact opposite of what Riot wanted to do.
Her late became better though, probably. Considering farming is easier now and W is quite a cool thing to spam in teamfights guess it did became better. You can't pull 3 seconds long ults or double ults now (unless you're building cdr, DFG?) but I don't think those were things you could rely on playing late game Katarina.
Refreshing E in teamfights isn't the point, 14 seconds are a real pain in the lane.
With the changes to Q you can't harras people from afar as much as you could before. Basically, you're forced to go all-in QEW to do damage to your opponent now, which does hit people quite hard, but you become a lot more vulnerable to ganks during these 14 seconds and the early W speed boost is not that much.
Basically all the same as before but the time window increased dramatically during early-mid just to justify the constant 20% reduction.
Add the fact that nerfing her ult hits her early-mid game too, which is the time most fights are 6 people at max and baiting out cc/self displacement abilities is easier and you actually could pull the full ult before, the fact becomes clear: Katarina became weaker early-mid game. Which is the exact opposite of what Riot wanted to do.
Her late became better though, probably. Considering farming is easier now and W is quite a cool thing to spam in teamfights guess it did became better. You can't pull 3 seconds long ults or double ults now (unless you're building cdr, DFG?) but I don't think those were things you could rely on playing late game Katarina.