I don't know. Wizards are a really great troop, and they are key in my GoWiPe attack in clan wars.
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Valks, as they are so weak.
Goblins are one of my favorite troops in this game. Combine them with giants and archers and you have yourself a really strong farming army. Splash damage may be able to shred them, but that's what the giants are for.
To answer the poll, healers are easily the worst. In lower levels they can be used effectively, but are so extremely expensive that it isn't worth it. And at higher levels, they don't stand a chance of sustaining a fight for more than 30 seconds due to the strength of the air defenses, archer towers, and traps.
Goblins are dumb because they sometime bypass a full storage and go for an empty collector.They also weak.Mine are level 2 until now.
Healers are pretty hopeless. Once TH7 ends the Healer is redundant.
The last time I used a goblin was probably in 2013.