They are still strong choices. They are slightly worse with the Black Cleaver nerf. Lee Sin, Wukong and Gangplank are also very viable in the middle lane even though they aren't necessarily assassins.
Back to assassins... they aren't very easily countered however, I've seen many wrecked by AP Cho'Gath mid due to his Feral Scream.
I don't know but I feel that Talon and Kha'Zix have much higher burst then Zed. However, Zed can farm from quite the distance with his shadow and shuriken.
Panth isn't a bruiser.
Zed is ridiculously strong in mid-lane. Kha'Zix is overpowered as **** atm. Talon works but he definitely has his counters and he lacks escapes till 6.
My question is specifically about Zed, Kha'Zix, and Talon though, as they are the only "true AD assassins" in my eyes. Pantheon feels more like a bruiser, and Twisted Fate is a mage to me.
I've gone Talon mid in my level 30 games (not ranked) and come out on top quite frequently. Most APs are squishy as hell. As Talon I always have trouble at level 1-3. At 4-5 it gradually picks up, and by 6 I can burst most people down quite easily. Early game sucks for me because rake does very small damage, but when you have all 3 moves and a level 2-3 rake, most mids will keep their range.
Talon vs Diana ... depends on skill, allot of times when playing Talon I can easily kill a mid Diana and when I'm playing Diana I can also get Talon, but if you are un aware you are f***ed
Back to assassins... they aren't very easily countered however, I've seen many wrecked by AP Cho'Gath mid due to his Feral Scream.
Some people just try to out push them with a pick like Anivia, or Gragas, and then they roam around the map.
Also Pantheon mid lane is still incredibly freaking awesome, why do people not realise this?
But is their damage on par with Talon or better?
Zed is ridiculously strong in mid-lane. Kha'Zix is overpowered as **** atm. Talon works but he definitely has his counters and he lacks escapes till 6.
Just my experience thus far
http://imageshack.us/photo/my-images/402/talonrecord.png/ . Rune page isn't complete yet, need quints.
The defeat was one where I had to go after slapping mid a couple times :(
I am sure it's different for ranked games, though.