Most useless upgrade

[RAppel]

Level 4 xbow. 8 million gold for a 5 damage per second increase....terrible.

This gets my vote.

[fortuna]

Mortars and healers.

[12gunner]

Air bombs, no matter what level they're at they still kill aNY level of minions in one hit and...that's about it, they completely suck when anything else triggers them you might as well rename them to anti minion bomb

[Tycket1]

Mortars lvl 8

Def this 10chars

[goey0614]

Healer...my opinion <_<

[victort]

Healer to lvl4 ...... hardly used them since I got to TH9 .... only any good for donating to TH8's and 7's (imo)

[krixykuno]

There is no useless upgrade.

There's only a wise upgrade and an upgrade that slows you down.
Everything is useful but pick the one's that are better.

[illuminandy]

collectors

[sj74]

Virtually all upgrades are useful. Some cost a lot for very little gain such as lvl4 x-bows. Walls cost a lot but the gain at lvl10 and 11 is actually very high. The most useless in terms of adding anything to youdefence capabilities would probably have to be either normal bombs that are pretty much pointless at all levels and air bombs which kill max minions even at level 1 (although I once put all my max air bombs together in front of my DE and it was funny watching them annihilate dozens of max balloons at once when people tried to loonion me in masters so maybe not so useless ).

[kizthewiz]

Walls. Too expensive at higher levels and if you have maxed defenses walls dont make that much of a difference.