Keep in mind overrated doesn't mean bad, sometimes they're bad sometimes they're really good but people think they're better than their actual level.
PRX - jingg (probably least overrated on the list)
DRX - stax
T1 - saya
LOUD - saadhak
EG - demon1
NRG - ardiis
TL - jamppi
FNATIC - botster
FUT - qw1
KRU - nagzet
GIA - Fit1nho
ZETA - tennn
BLG - whzy
EDG - nobody
FPX - yuicaw
NAVI - suygetsu