User blog comment:WhiphTikoto/Servant Tier List/@comment-28209103-20170510021734

Just a suggestion but you're separating them into too many tier which makes it impractical and definitely gonna start a war.. so making it simple is better. just remove the +/- tier and the S tier too, just move it into the missing E and remove the F. [therefore EX,A,B,C,D,E per nasuverse rule of stat and tier]

also as of now there's no Useless servant on FGO, tho there's junk tier who can be put on E or maybe D rank. and to be honest I can claim that majority of the servant belong to the C or higher with only less than 10 are considered junk tier. The reason is that there's no real 'Meta' in this game therefore all servant are useful to some degree depends on your team aims and your servant roster.

btw I'll name Asterios as A rank servant,, Hans too,, also Cursed Arm Hassan...

EX probably are limited to the Trinity + Monster.. a.k.a Waver, JAlter, Merlin + Cu Chulainn Alter.