Level 6 Wizards (Need to be buffed)
The change between level 5 wizards to level 6 has a significance far too low, compared to its supermassive upgrade time and cost. In a video, this was proven to have very little or no difference on the battlefield. Take a look:
DPS: 170 - 180 (+10)
HP: 156 - 164 (+8)
Research time: 14 Days (+9 Days from lv4 - lv5)
Research cost: 7,500,000 (+5,000,000 from lv4 - lv5)
It just isn't worth it. Cannons / Archer Towers deal about 90 damage per hit and +8 HP isn't going to help. +10 DPS is definitely not going to help matters, either, if you take a look at building and storage hit points.
Now, it just comes to the point where the only upside to upgrading them is for their look.
+1 if you agree (probably going to get a lot of hate comments)