Shaco mains only

i love shaco style . but in my opinion i see hes weak i mean when anyone just dmg him his hp goes so fast plus he doesnt have that dmg as yi or jax .. but hes cool to play . when i play him i need to focus on every move . how can i deal highest dmg as possible? should i go then build some crit? and other thing about the passive . i think it has been change this season cuz whenever i build AD the physical dmg still 27+ in passive only . the last games when i buy dmg the passive goes like 200+ dmg , should i build ap? but how can i deal with it? theres any tips? is shaco good to play in any ELO ? or just the high ELO and need a good team....... my pleasure