Command and Conquer 4: Absolute garbage that completely failed to capitalize on the sequel hooks left behind by Tiberium Wars and Kane's Wrath

Halloween Kills: Michael Myers is supposed to be an ambush predator, not a Terminator. He's hard to put down, sure, but he wins because he gets the drop on vulnerable targets (and even then he doesn't always win, as seen in the original Halloween). Having him leisurely wade through armed mobs Dynasty Warriors style completely misses the point of the character.

XCOM Enemy Unknown: This one was painful because it did make a lot of decisions that genuinely improved on the original, such as tossing much of the useless research options and redundant equipment along with providing a much friendlier UI and better tutorial. On the other hand, though, it was disappointing to me in a lot of ways:

• Making individual soldiers much less versatile. They get automatically assigned a random class, something over which you have no input, and that class is fairly locked into its role. You don't look at a soldier's stats and judge for yourself whether they'd make a better sniper, scout, or heavy, and you can't, for example, give a Heavy a sidearm and have him help sweep a UFO's interior.
• Severely restricted action economy. In the original game, you could have up to 14 soldiers in the starting Skyranger. In the remake, squad size maxes out at 6. A single lucky enemy crit dropping one of your soldiers, ora rookie panicking because they got shot at, can be crippling.
• Strategic decisions feel much less organic. There is no question of balancing saving money and space vs. having more soldiers, fighters, and transports so you can respond to more events at once. No more deciding when and where to build new bases, radars, and hangars so you can better detect and intercept UFOs. No weighing your performance and deciding whether that battleship you raided earlier this month will offset the reputation hit you'll take from passing up this hellish-looking terror mission. Instead, you get explicit binary choices between different missions, UFOs that show up whenever they feel like it with no real way to improve your interception rate.
• Proper reconnaissance feels much less important. Not only does the limited action economy make dedicating soldiers to recon much less appealing, but enemies tend to appear in discrete groups, then move out of turn in ways that let you see where they're going. It makes encounters feel less tense and organic and more video gamey.
• The presence of civilians in terror missions feels a lot less meaningful. In the original game, they were a constant concern. You didn't know how many there were or where they were, and it forced you to weigh the risk vs. reward of every full auto shot and use of explosives. Knowing exactly how many there are and being able to move a soldier next to them to have them instantly vacate the battlefield makes them much less impactful.