These are all that I can think of for now, they're pretty common gripes, but I saw a few that hadn't been mentioned yet:
-Any RPG that forces you into a easy, time consuming, hand-holding starter dungeon or lengthy unskippable cutscene (looking at you Elder Scrolls/Fallout). If it's my first time playing the game, of course I'd want to figure out the controls and get a little exposition, but there always should be an option to skip it if you want to.
-Assassin's Creed II, you are my favourite AC game, with the best missions in the series. So why why WHY didn't they think to include a replay mission ability in you? Just because I want to fly the glider again doesn't mean I want to spend 9 hours getting there.
-Halo 1, 2, 3; all excellent shooters, but each having that ONE mission that strains your desire to continue playing (Library, Sacred Icon, and Cortana). All unironically involve the Flood, go figure. Also Reach for being a complete cannon-fuck
-The endgame of Rome Total War, or most of the series. It devolves into mindless, endless fullstack on fullstack battles every turn, especially in Rome.
-The complete lack of ability to sidestep the most obvious betrayal setup in the history of subterfuge in Dishonored. Come on, you protected the Empress for years, like you never had to unravel a single plot.
-KOTOR II for having more bugs than an entomology convention.
-Morrowind, the dice roll combat. It just flat-out doesn't work in that style of game; it's like the enemies have a black hole on their torso that absorbs my blows 20% of the time.