Season 11 only.
This doesn't match my ranking of the entire cast,
Only ATM.
BEST :
Miranda Bailey
April Kepner
Stephanie Edwards
Maggie Pierce (honestly rising in my list)
Callie Torres
Meredith Grey
Amelia Shepherd (I haven't watched private practice, but I know slightly about her past.)
Richard Webber
Jo Wilson (so irrelevant)
Arizona Robbins
Alex Karev
Owen Hunt
Derek Shepherd
WORST :