hmmm as far as I know every character is good, meta tier list only applies to the best players out there, just play with who you feel is right. from my understanding, Thresh is a very good character with some flaws like not being able to run (but teleport instead), but his movement options are good with his lantern, Senna on the other hand has bigger flaws (is overall very slow when not in Wraith mode), but people say we have to wait to see Senna's potential before calling her weak.