Nightmare Fuel: When you kill a "person" unit with a flamethrower or Flaming Arrow, he/she catches fire, screams, and begins running away. Soon the run turns into a stagger, then the poor guy falls to his/her knees, rolls on the ground–still trying to put out the fire–and finally dies. It's almost a relief to see the muscles in their body relax and the corpse lie peacefully on the ground.
Crazy Awesome: One of the Japanese unique units is, of course, the Samurai, replacing pikemen. What do they evolve into during the Industrial Age? Gun Samurai.
The B-2 Stealth Bomber. It bypasses ground-based air defenses and can only be countered by Jet Fighters in staggering numbers. The only sure-fire way to really stop them is by razing their airfield and hope that the enemy doesn't build a new one in time. The catch? That airfield can be anywhere on the map.
Which can be solved by yet another Game Breaker, The Space Program (a Saturn V launch stand), which gives full sight of the entire map. Games can become races for this wonder and become battles to defend them against the Stealth Bomber.
Probably the least variable mileage entry, the Terra Cotta Army. Free basic infantry every few seconds. Forever.
Needs More Love: Rise of Legends received the "The Best Game No One Else Liked" from Voodoo Extreme.