Diana needs to be readjusted
I'm going to be totally honest, Diana needs to be reworked. FYI, I played Diana a lot in Jungle (75k points or something with her) so before you going on to say some stupid bullshit about how I'm merely complaining about Diana stomping me. I don't see Diana that often, and I know for a fact that if I can literally just jump into the enemy team (look at match history) , 1v5 when pretty much over half the team built MR, and get with half HP. I call that pretty stupid. No one was around to even pick up an assist. I straight up 1v5ed, and it took no skill at all.
I'm not sure what Riot would do on path with Diana, but if she's going to be an Assassin, then you should reduce the AP ratio on the shield. and if you're going to make her a bruiser, nerf her overall ratios, but give her some more utility with her E and maybe buff up the shield. She's like pre-nerf Elise right now. Way too oppressive.
Another instance, I was 400 health, TF was ulting to me, I was pretty fed but when TF arrived. I messed up my combo, and was left with only my W and my autos. third hit did 1400 damage with Sheen Proc and Nashor's Tooth, literally her only counters are Mordekaiser, Syndra, Irelia, and Devourer Yi or Xin Zhao, Lee Sin in early game jungle too. But you don't see Mordekaiser waltzing down midlane that much, and Syndra is pretty rare to see too. Irelia can be negated by a decent top laner, because DIana doesn't go top unless she's AP bruiser.
Oh yeah, MAKE THE RANGE ON THE Q MATCH THE RANGE OF THE DASH. SHEESH!