Age of Mythology: Imbalanced civilisations; zerg-rushing Norse cavalry; poorly implemented 'Wonder' mechanics.
Sims 2: Unnecessary number of expansions, necessitating spending an absurd amount to get the whole package.
Half Life 2: Relatively crappy vehicle sections/ vehicle controls. That's all I got.
Harry Potter & the Chamber of Secrets: Terrible voice-acting, terrible boss fight. Overall good game despite it's age.
Star Wars: Battle for Naboo: Control scheme in general needs improvement here. I can't remember this game well.
Arkham Asylum: The Croc section, and the final boss fight.
Guild Wars: Nightfall: Terrible romance sub-plot. Relatively bad cutscenes all-round.
Doom 3: A typical screenshot of Doom 3 [http://coolblackppt.com/wp-content/uploads/2013/07/Full-screen-black-background-latest-50-images.jpg].
Simcity 4: Rush Hour: A typical screenshot of Simcity 4. [http://heartsoulstrengthmind.com/wp-content/uploads/2013/07/city-on-fire1.jpg]
Silent Hill 4: The Room: Haven't yet played it.
Portal: ...too short, I suppose, but it's such a solid game.
Futurama: Completely different combat schemes for three different characters. No cross-over, so you've got to learn how to play the game three times.
Sonic Mega Collection: There's no damn reason to collect more than one ring, unless you're on the first few levels, when 100 rings is a realistic goal.
Half Life: Generation (HL1, Blue Shift + Opposing Force): Clunky jumping sections. The final 10% of HL1 is one huge clunky jumping section.
Battlefield: 2142: Hrmm, this is difficult. Shitty Anti-Air weapons.
Guild Wars: Factions: Abysmal voice-acting (particularly Danika, who haunts my nightmares). 90% angle difficulty curve. Shorter than the other GW1 instalments.
Dead Space 2: Loses some of the atmosphere that made DS1 so terrifying; relies on jump scares. Still a great game, despite what people say.
Mass Effect: Gives you very little indication of the requirements to save Wrex!!
Guild Wars: Prophecies: Started off without mouth movements, and even when they were added, cutscenes remained clunky.
F.E.A.R.: Keeps its combat sections and its horror sections completely separate, so you know exactly what's coming.
Harry Potter & the Chamber of Secrets: Oh, shite, I already passed that one, meaning this second copy is one I must have accidentally stolen from a friend.
Batman: Arkham City: Damn, close to perfect. Deadshot was disappointing.
Final Fantasy 7: Leaves you without a paddle more than once, as I've said before. Yuffie's sidequest is also rage-inducing.
Guild Wars 2: Scarlet Briar.