I've played Shen a lot before but for awhile sense I came back to this season I've been doing poorly at the early game. I don't think this is player skill anymore but lack of foresight when balancing Shen vs other champions. It's like everything Shen can do, another champion can do it better. Zed, Shen's rival isn't countered by Shen. He just uses burst damage and shadows to avoid standing around to fight and kills shen off easily due to being burst damage focused while shen is only dps sustain focused that requires constant hitting which he can't do to a Zed or fleeing enemy.
The early game of:
As top shen, Shen get's easily pushed into his own tower at early game and can be kept there constantly defending it while minions tick away the tower due to not having any good wave clearing abilities. Shen isn't offensive enough to push back the top laner if they are more offensive like Zed, Riven Renekton, trynedamere, shen is out matched in damage dealing to be able to stop the top laner. along with his energy depleting if he try's to fight and harrass a single champion away.
Jungle Shen suffer's from the same thing of being counter jungled because of his low wave clear time but why would a player want him jungling when he only has one form of crowd control to gank with in the early game paired with a low amount of damage dealing when he's usually built as a tank.
As a Support Shen he lacks healing while it being reliant on hitting an opposing minion or champion that's hitting him or his friendly champions. The casting range of his abilities do not reach as far as AD carries or other champion abilities. His shield ability can't fully block one tower shot or stay active long enough to provide the bonus cool down for ki strike. His taunt ability takes too much energy when he hits one champion with it. His ultimate has a very long cool down and can barely shield a allied champion before they die without ability power items and with runes.
I believe this champion is no longer viable for an enjoyable experience because of how lack luster it is in early game and who ever picks it will cause a horrible experience for others around them due to the low capabilities of this champion. The only thing Shen is good at in early game is getting killed.
I'm for a rework of Shen.
I would take away his sustain from Vorpal Blade that made Riot nerf him to death and replace it with a slow and movement buffs. Changing Vorpal Blade into a poking Skill Shot that reaches as far as Sion's minion hit range of roar of the slayer. Making it not go through minions but go through walls. When it hits a minion or champion they are slowed, take magic damage, and marked to increase any allied champion or Shen to run faster to them. If the Vorpal Blade misses it sticks to the ground and still gives movement speed buff to any allied champion or Shen running toward it. If Shen touches the vorpal blade on ground or on a enemy he picks it up regaining energy and can do a Ki Strike after but costs energy to do and the chance to do the Ki strike will remove itself after a certain time if not done.
Passive changes to Ki Strike:
Ki Strike no longer regains energy but costs energy to do. Ki Strike is now a Small AOE Magic Damage twin sword attack around Shen and does not proc without using it at the end of shens abilities.
Upon using Ki Strike Shen also dodges all damage taken for the duration of Ki Strike when used. Or momentarily increases movement speed, or momentarily adds attack speed to shen's attacks.
Shadow Dash would have energy and cool down lowered a bit. Shadow Dash will do AOE magic damage to all types of enemies it passes through, taunts them and applies damage reduction to shen. After this ability is used Shen gains the option to use Ki strike at the cost of energy.
Feint name changed to Vorpal Feint. Vorpal Feint puts up a magic shield around Shen absorbing damage but while active Shen regains energy and has the option to end the shield with a Ki Strike after a duration and with a cost of energy. If the full duration goes by he'll heal himself like kayle but will also heal nearby allied champions.
Ulti-Stand United changes to not only shielding a ally before he arrives instead Shen throws a vorpal blade across the map to form the shield around his ally and then shadow dashes(with old stand united sound) across the map pushing aside everything he comes into contact with to grab the vorpal blade exactly as he gets to the shielded allied champion to perform a big AOE sonic boom like Ki Strike pushing away enemy champions and monsters.
It's all movement based to favor a Ninja that can't be caught by light and directly targets the weaknesses I've found while playing him as any of the role's I discussed.
A Kiting tank play style should work with these ideas and make Shen more supportive at the same time.