I sharded it and I do not regret it as I used him extensively, however...
That was another meta, the character itself is good and a good option very flexible single attacker, still use him at times but as mentioned meta changes almost every patch.
Some highlights:
True damage (i.e can pass thru some defense/void shields without activation and can be high damage)
Extra turns, yes he can chain up to 6 attacks, kinda like GRE.
Shield/self heal (power of light), can be conveniently used for example to save a match if he is the last character standing in a 1v1 standoff even vs a nomad.
Duelist (revenge) works nicely under the right conditions and gives extra damage.
Mainly a one character at a time attacker with multiple strikes, his Fury skill hits all.
Has some benefical effect removal
He is not so good on defense as AI is lacking and insists on using 'killer instinct' constantly on whomever and attacking the invisible characters.
His Fury can be a little a hit or miss but most of the times it's helpful.
Is he good?, yes, he is a Top shelf Eddie.
Is he the best?, close but no (IMO), but depends on your particular team situation.
Is it a worthy shard investment?, well he is a good value for your shards, only takes 19 shards to complete, and one can do much much worse with other eddies.