I know that e+flash is shen's bug skill but does it really worth it? It may work for some important team fights but always i see Shen use e+flash is for one kill. A kill worth it? I mean if Shen used ult for helps, maybe bot or mid. Then his top lane must be pushed by the enemy top laner or jungler. At that time, a flash Shen can not handle both help and lane. That means, 1 help= almost lose a turrent, and if that help is for saving ppl but not killing enemies, then, it's obviously a lose.
Teleport flash shen can handle both lane and helps but he is not strong at solo. Top laner may beat a flash TP shen ezly. Do Shen need a gank?! No. That's y i choose ignite and TP. This kind of Shen may not have that ability to kill a far away champ and may fail a kill while the enemy champ has flash, but he can help the other lane and after that, he can back to his lane quick to keep farm. 2ndly, for early kill, if the bot support used a ward in the far bush and the enemy team doesn't ward there. Shen can TP that ward at lvl2 or lvl3 whereas adc and support are both 1 level lower. That help may give u a FB money.