They aren't weak, you just don't have enough ADs to defend against mass dragons as a TH7.
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Nope, they are fine.
Air units have advantages.
1) They look at your level 11 walls and laugh at you.
2) They look at your maxed mortars and cannons and shake their heads in dismay.
3) Air units like Balloons ( high DPS/camp space ratio - the highest of all air units) only target defensive structures.
4) Dragons / Hounds have very high HP.
So to protect against these threats, you do need HIGH DPS DEFENSIVE STRUCTURE - that's the AD.
Lets, remember mass dragon at th7 is expensive and if you add 3 lighting spells it costs, a lot so the chances of you getting attacked by it are small
If Air Defenses are too strong against air troops...
Then air troops are too strong against ground-only defenses.
If anything I wish AD was a little stronger. Not strictly a numeric DPS increase, but rather have a splash damage element to it (no, not as much damage as the actual hit does, but do some minor damage to overlapping units for example).
oh wow AD too strong... really?