i would agree that these ninjs are bad, but thats something vastly different to saying they are unviable, uta and roshi are strictly bad value from the perspective of an f2p player when compared to characters like roshi or fu, this doesnt mean the ninjas are 'unviable' but it means they are bad compared to what else is available...

from the perspective of someone who can buy any ninja they are quite dececnt.. but in the grand scheme of things... they wont give you good value...