[{quoted}](name=Big Lincoln,realm=NA,application-id=3ErqAdtq,discussion-id=qA2u70sm,comment-id=000000000002000000000001,timestamp=2017-01-03T19:54:36.434+0000)
Tahm is a Juggernaut with support qualities. Shen is a fighter/support and he (used to) do respectable damage to back up his utility.
Tahm is listed as a warden first and foremost. If you want to list him as a juggernaut, that's fine, but then you need to acknowledge that his CC is way above-average for a member of that subclass (no other juggernaut has more than one instance of hard CC, for example, and most juggernauts have very little overall crowd control). Shen is also a warden with diver qualities, but his dueling power is tempered by a complete lack of range and extremely situational sticking power. Tahm is slow, but even that much is partially countered by his ranged damage, and his own sticking power is much more reliable.
[{quoted}](name=Big Lincoln,realm=NA,application-id=3ErqAdtq,discussion-id=qA2u70sm,comment-id=000000000002000000000001,timestamp=2017-01-03T19:54:36.434+0000)
Tahm doesn't have a global shield or a dash, or a wall that blocks all incoming projectiles, a massive AoE slow that saps attack speed, etc. He can't engage or counter-engage like Braum, he can't protect you nearly as well as Shen, and he can't completely disable a rightclick champion like Nunu can.
If you want to do pure ability comparisons, then I can say that none of those champions can give their ally a 6500 range blink, or 6 seconds of stasis, nor can they regenerate 90% of poke damage, shield themselves for 40% of their max health, or deal large autoattack damage just by building tanky. His protection is significantly more consistent than Shen's, which is why he was picked in Worlds 2015 specifically just to protect the ADC, he can disable any champion much harder than Nunu, and he has many more options than Braum when it comes to entering or leaving fights if an ally is around (he can teleport right in the middle, or pick up a friend to gain bonus movement speed when going in, neither of which Braum can do). In the end, the point isn't that Tahm outperforms all of these champions at once, but that he gets to do a little bit of everything: he's a Warden who can play hyper-aggressively, a juggernaut with two ranged abilities and hard CC, a support with great dueling power. That's the reason why he was overnerfed, he does too much.
[{quoted}](name=Big Lincoln,realm=NA,application-id=3ErqAdtq,discussion-id=qA2u70sm,comment-id=000000000002000000000001,timestamp=2017-01-03T19:54:36.434+0000)
Tahm Kench's kit is fine. His numbers were the issue; they were far too high and rewarded him too much for not building a single damage item. Now they are too low.
The issue with his numbers specifically is that his combat pattern is still very stat-checky: if he builds enough health, he can out-tank and outdamage his opponent, and if he doesn't, he loses on both fronts. Giving him health-to-damage ratios was not a good idea, and is a major cause of his current instability.
[{quoted}](name=Big Lincoln,realm=NA,application-id=3ErqAdtq,discussion-id=qA2u70sm,comment-id=000000000002000000000001,timestamp=2017-01-03T19:54:36.434+0000)
Tahm is a troll pick right now.
That is usually the case for overloaded champions: if they're strong, they're really popular, but the moment they're even slightly underpowered or just balanced, they drop out of visibility altogether, bar some very few exceptions (e.g. Lee Sin).