tbh shen is my go to champ when i cant play jungle and have to fill top.
shen top is good, you get quick levels, and you dont need to back alot since you get quite enough sustain with your Q passive
shen jungle i think it shouldnt be played, his camp clearing is slow & he only got 1 CC and if you miss it the gank can go horrible wrong
also sometimes i like to build him kinda maybee 'strange' with sunfire, mercs, hydras, trinity (last 2 items depends on enemy, they are tanky tho)
and he's not only 100% ban in bronze, silver, gold, also for a good 90% ban/pick in platinum. Don't know about diamond/challanger.
its not just that shen is a good splitpusher. His ult just scares people off so hard.
Like today, 4man gank botlane vs our 2man botlane, i ult in and they backed while they had enough space to chase / re-engage