Tier 1 – Lee Sin, Dr. Mundo, Udyr, Nocturne, Trundle, Jarvan IV, Maokai, Nautilus, Skarner, Alistar, Riven, Olaf, Shyvana, Shen, Malphite, Amumu, Cho`Gath
Tier 2 – Warwick, Shaco, Hecarim, Jax, Gangplank, Darius, Master Yi, Sejuani, Volibear, Rammus, Fiddlesticks, Xin Zhao, Wukong, Nunu, Tryndamere
Tier 3 – Kayle, Gragas, Twitch, Galio, Fizz, Renekton, Pantheon, Rumble, Fiora, Singed, Twisted Fate, Janna, Blitzcrank, Kennen, Taric, Sion, Ezreal, Soraka, Karthus, Cassiopeia, Lulu, Ziggs, Leona, Heimerdinger, Brand, Yorick, Eve, Mordekaiser
Tier 4 – Caitlyn, Corki, Veigar, Poppy, Karma, Nasus, Irelia, Malzahar, Draven, Sivir, Akali
Tier 5 – Viktor, Graves, Varus, Orianna, Garen, Ahri, Talon, Annie, Urgot, Kog Maw, Ashe, Sona
For tiers 1 and 2 - the placement is more important towards indicating "who is better" but less so for tier 3. In tier 3, just think of it in brackets as the champions here are more flawed and harder to argue. You can say that the higher tier 3 champions are better than the lower tier 3 though. For Tier 4 and 5 it's pretty much wishy washy.
Some people seem to be getting confused with the ranking. It should be obvious by seeing who gets the S scores that S means higher than A.
S scoring is just some video game thing used to say things like “Oh man you are amazing” etc etc. It’s most commonly used in arcade type games.
Btw before I go on I'll just state who it think some of the best PICKS are at the moment. The obvious Mundo and Nocturne (due to tournament player) are there as well as Nautilus (for teams) and Olaf for counter picking-jungle carry status. Lee Sin is always a safe one while Udyr tends to be binary depending on the competency of your team. When all else fails - pick the all purpose Jarvan.
The things that have changed this time around
Pantheon and Galio - Moved up slightly for just being better than a few others.
Sejuani - Moved up because she is better than those below her at least "better off" and she's honestly still a really powerful and annoying ganker. That sustain is just terrible though.
Shaco - finally moved that snowball dependant bastard down and may move him down some more
Malphite - He just has cleaner match ups than Amumu and I would even argue a safer transition so he takes his spot.
Darius - He's a really fun jungler but you shouldn't rush him to fight opponents like Ashe and Janna. He'll get kited to hell and back in team fights and in the jungle he won't get as much farm but he's an honest to goodness godly invader. His sheer damage output in jungle battles especially when double buffed is incredibly deadly and he's a pretty fast jungler who only gets faster with levels. He deals so much damage that if he jumps anyone they're likely dead or forced to back.
Shen - He left his "to 6" brother because his ganking is actually a lot more deadly than I was giving it credit. In all honesty I rarely got to play him because he was banned so much but for some reason I got a few chain picks of him and man his pre 6 ganks are deadly and he can even pull off painful level 2 ganks. His damage output is underestimated and he is pretty mobile thanks to his 0/21/9 build with MS quints. He's still slow as hell but everything is very powerful. Give him a leash and his speed problem is solved and then he gets his global jungle pressure.
Udyr - Honestly he moved down for similar reasons as Skarner. It's hard to gank anything as Udy rnow without having to burn flash or relying on bad play for the opponents. He can still invade incredibly easy but some aggressive paths are cut to him due to his early mana restrictions.
Trundle - I moved him back up because I changed my build back to the most classic of builds and holy crap is it even better. I've been running him armor pen red and quints with a 9/12/9 build and he just breaks other junglers in half again. The only jungler to even give me an issue was Olaf but even then it came down to who was healthier when we faced each other. I also start with vampiric scepter and holy crap do I lose no health at all when jungling. I will be uploading examples of this soon in fact. I was taken down to 120~ health at level 1 due to a fight yet still jungled. I ended the level 4 improv path at full health. Vampiric Scepter does mean he has less mobility but that's where his W comes in.