So basically I loved playing tank Jungles in season 1 and season 2. It was an important role, you were there to turn the tides of fights by providing a big meat wall or throwing out some cc to chase/hold/peel for your carries to fight. It required good game play and team-work for a true tank jungle to be an effective weapon. You couldn't go balls deep and expect to win a 1v1 or dive without the damage there.
Xin Shao has ruined that. As a tank, and most people have figured out, there is no real purpose to stacking defensive properties anymore. You need as much health as possible with some, very little compared to before, armor and magic resist. The reason I'm complaining about this is not only has it affected tanks but it flooded over and is disproportionally affecting burst mages.
The reason I picked Xin Shao as the reason for the fall out is the combination of items and his new passive have effectively made "bruiser" and "fighter" the new tank. They do damage while still building enough resistances to jump in and with little resistance destroy any carry that is caught out of position. This used to be the job of assassins, to dive in and maul a carry while bruisers and tanks would peel for the carries to try and stop the assassins or initiate when needed.
With Xin Shao it's beyond simple, build Black Cleaver and Last Whisper. 2 Items, Not very expensive when compared to the amount required by others to reach their peak but anything after those 2 items is an immediate bonus on Xin. You can pretty much do whatever you want after those two items because with only those two items Xin Shao disregards 15% + 25% + 35% of a persons armor... that's 75% of someone's armor out the window before you even bother with his flat armor pen and 40% ripped to shreds for his teammates to enjoy. It's just beyond disgusting because with that amount of % armor missing he can build less hp/armor/mr and be tankier than a champion designed to do nothing but tank.
Even with Rammus, someone who excels in having a massive, masssssivvveee amount of armor is reduced to nothing but a lower-damage bruiser by this 1 champion alone. I use Xin as an example because of his 15% armor shred passive, but even with other champs it's not hard to build BC and LW and still ignore 60% of someone's armor like it is nothing. Seriously Riot why would you purposefully take the strongest classes in the game and make them even stronger for S3 while disproportionally affecting tanks and burst mages in a negative way.