As with any "Should I" question there are a vast amount of variables, but mostly what are you sacrificing to obtain the ninja? Is spending 10k+ coupons worth the power offset? Will you wait until hes redeemable? etc.

Five Kage Madara is a top tier support ninja in the respect that he can shut down the enemy team completely, but his true usefulness is situational.

Pros:

Turn 1 prompt mystery to remove all buffs/shields and lockout mysteries.

2x Chase to potentially steal 40 chakra per turn and acupuncture a target. (Compliments many pos1 ninjas like Minato)

20 Hit chase to ignite entire enemy team.

Can be a great front liner if opponent relies on chases.

Cons:

Cannot dodge interrupt mechanics (Susanoo Itachi, Iruka, Anbu Yamato, etc.)

Mystery may be useless

All damage is chase reliant

Tends to die fast to poison/ignite