These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Joseph Stalin in the original Command & Conquer: Red Alert is portrayed as every bit the ruthless, paranoid dictator that he was in real life, but excludes any redeeming qualities he had and makes him even nastier in some regards. He builds up the Soviet military machine and invades the rest of Europe to establish his totalitarian rule over the entire continent. He orders his security officers to test Sarin gas on a town of innocent civilians and the player to kill the survivors and raze the village, personally kills his lieutenants for any failure and orders purges of his entire military staff on a whim, and largely destroys the countries he invades as he did with Greece. When the tide of war turns against him, he uses his troops as sacrifical lambs to delay the Allied advance long enough so he can destroy the major European cities with his newly-developed nuclear missiles and force a victory.
Yuri from Command & Conquer: Red Alert 2 is a powerful psychic and aspiring overlord initially serving the Soviet Union, but soon reveals his ulterior motives. In the Soviet campaign he supports the invasion of the United States and later the rest of the world, building devices to turn the conquered peoples into mind-controlled drones. He assassinates Premier Romanov and frames General Vladimir to usurp the Soviet leadership, before attempting to kill the player because his continued succes has made him a potential threat to Yuri's position. Yuri's Revenge reveals that he was just using the Soviets to establish a network of mind control devices to enslave the planet, so there will be no will but his own. His subsequent plots include harvesting the entire population of Los Angeles for raw materials, holding a software company ransom and nuking Seattle until they give in, secretly assassinating world leaders and replacing them with clones, and planning to level all coastal cities in the world. Throw in the fact that his army uses slaves to mine their ore, genetically alters soldiers and civilians alike into obedient, mutated freaks, grinds up civilians, captured enemies, and his own units for spare parts or drains them for bioelectricity, and is built around mind controlling his adversaries, and it becomes clear that we are dealing with a very, very bad man.
Namely, Flying Discs with lasers and tractor beams, tanks and static defences that can mind control enemy units, and missile submarines.
Don't forget that you can shut down an enemy's entire base with just four Flying Discs. Park one over a Power Plant, another over their Refinery, and one near any building that can produce anti-air infantry/vehicles. Not to mention Yuri Prime, who can mind-control buildings (and with the Cloning Vat, you can get two Yuri Primes!)
Uprising introduces us to the Harbinger gunship, a nigh on invincible self healing flying fortress. If you can build up a few then they make the attack move option a 'I win' button.
Don't forget the Empire's Giga-Fortress. Just one of them can take away a quarter of a Harbinger's health in Sea-Fortress mode. And don't get me started on Sky-Fortress mode!
The Sky-Fortress modes is the main use for them. They outrange anti-air units, and do insane damage.
The Apocalypse Tank in Uprising gets some major upgrades. Its magnetic harpoon weapon now keeps enemy units from shooting back, so if you micromanage them right you can easily defeat a force tier-3 armor of the same size without taking any damage, and they can used to pull ships on land to instantly destroy them. However, it's not considered a gamebreaker merely because of Harbingers Gunships and Giga Fortresses.
Ham and Cheese: Goes a long way towards describing the acting in the series. And man, is it fantastic. Or at least in the later games. The first one had very subdued performances to fit with the serious tone of the game itself.