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.
Complete Monster: Yuri 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.
Even Better Sequel: Red Alert grows beyond being an expy of the Tiberium Saga with this installment and many interesting gameplay additions are introduced. The Lighter and Softer camp elements add charm without completely derailing the game. The invasion of mainland USA scenario is as good as it gets. Stalin is hard to replace as a villain, however.
Fridge Brilliance: Yuri's faction. He uses units outright stolen from both the Allies and Soviets, who paint themselves blue and red, respectively. The color of Yuri's forces is purple - a color created from mixing red and blue.
Yuri Prime (Yuri himself) is his faction's strongest unit. If you have an Allied or Soviet engineer capture a secret lab (which allow players to get other nation's special unit), you'll only get a Yuri clone, which is an Elite Mook of sorts. Players may cry unfair to this, but if you consider that you'll basically clone him, not to mention if you listen to Yuri Prime's Badass Boast, it makes perfect sense.
Yuri Prime: "There's only one true Yuri!"
Made into a hilarious headscratcher though because with The Yuri faction's own cloning vats you can have 2 Yuri Primes.
Fridge Logic: In the intro, a Soviet Apocalypse Tank is shown dramatically crossing the border from Mexico and driving over a 'Welcome to Texas' sign, crushing it...except the 'Welcome to Texas' side is facing the viewer, which makes no sense. Chalk it up to Rule of Cool.
"Funny Aneurysm" Moment: Destroying the World Trade Center Towers in Red Alert 2. Of course that is entirely up to the player to do. However, destroying the Pentagon isn't. And that's the first Soviet mission. To further hammer the point home, Red Alert 2's original box art featured a burning New York City skyline, with the WTC on fire. After 9/11, Electronic Arts recalled all of the unsold units, and for a month, you couldn't even buy the game. What did the new, less offensive box art feature? No NYC, but the American flag in the Soviet commander's monocle was replaced with a mushroomcloud.
Game Breaker: Yuri's entire faction. It's so bad that Yuri is usually banned from online play.
In particular, the UFO's. 2 of them can entirely shut down a bases power and slowly drain your credits away, zapping any anti-air infantry/vehicles that try to shoot them down. If these little bastards shut down your base, your only hope is pretty much to have enough aa to take them down, or have an ally help you.
France can be considered this from a defensive/turtling point of view. An arrangement of Grand Cannons and Patriot Missile batteries is nigh-impenetrable.
Harsher in Hindsight: Cool as it is in-game, the destruction of Washington and New York evokes tragic real life events after 9/11.
Obvious Judas: Yuri, for the Soviet Union. There's something suspicious about him from the very beginning, and he only gets more suspicious as the game goes on. By the time it gets the point that Premier Romanov is murdered, it's already blatently obvious that he has an agenda. Then comes his 'proof' that General Vladimir is responsible. Miraculously, the player character still seems to see nothing wrong (or alternatively, he did, but felt powerless due to not having any solid counter-proof).
Unfortunate Implications: As well as being Harsher in Hindsight, the game's original cover (the trope image) depicted the World Trade Center with a plane flying directly towards them. Understandably, later re-releases had this removed.