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.
Porting Disaster: Arguable for the console ports. While they are solid from a technical standpoint, the versions on the Dreamcast, PS2 and GBA didn't even try to give you a sniper controller, or any form of light gun support at all for that matter, which took out a lot of the games' appeal. The Xbox version did have light gun support, and some editions even came bundled a sniper rifle accessory, but the scope didn't really work and it was very unwieldy and cheap-feeling.
That One Boss: Cobra, in the first two games. In the first game, he's either running with the president's daughter on his shoulder, or riding in an erratically-moving car while using her as a human shield, and ramming you with a semi truck after that. In the second game, he once again uses a human shield while on a moving vehicle, and he also throws alot of stuff, including hostages, at you.
Monica in the original. She wears armor, has 10 Hit Points (instead of 5 for previous bosses), hides a lot, taunts you repeatedly, and uses the President as a human shield.