KING'S QUEST
Probably the earliest KQ that I disliked was the third one. I didn't care about the character and that damn wizard kept killing me! I realize part of the story was to find out more about you and kill the wizard (or at least make him edible), but none of it meant a lot to me.
I didn't care for KQ7, mostly because the cartoony graphics threw me. Maybe that's a shallow reason, but I couldn't play a KQ that looked like it was created by
Don Bluth.
Despite how much I like action, KQ8 didn't do much for me. It's not a bad game at all, but it doesn't really fit into the KQ setting. I think more people would've liked it (or at least not hated it) if the game had a sense of humor and/or it was marketed as "part of the KQ universe" or something similar.
SPACE QUEST
I don't know why, but I hated SQ6. I loved every SQ game before that, but the sixth turned me off. It wasn't an awful game, but something about it made me want to exit it as quickly as possible.
QUEST FOR GLORY
Probably not a surprise, but I didn't like QFG3. I don't think very many people did. I didn't hate it, but it seemed off -- almost like it was an incomplete game or just "filler" between QFG2 and QFG4.
POLICE QUEST
While I really enjoyed the first three PQ titles, the fourth one was a real let down. Gates did a decent job with PQ4, but it didn't have the same "feel" as when Walls was behind the games. I think PQ4's biggest fault was the main character wasn't interesting. I didn't care about John Carey like I did Sonny Bonds.
LEISURE SUIT LARRY
No surprise here, but I didn't like
Magna Cum Laude. It was interesting -- and even a little funny on rare occasions -- but still fell flat against previous LSL games. Yes, MCL counts as a Sierra game, since it was published by Sierra.
The worst game I've played was
Leisure Suit Larry 4. There was no meaningful content at all! Just random diskettes in hidden places.
GABRIEL KNIGHT
I have to be honest here and admit that I've never completed a single GK game.
I almost finished GK1 back in the early 1990s, but I had hard drive issue and lost all of my saved games. I tried replaying it recently, but the interface pissed me off too much to continue.
I did play SOME of GK2 and GK3 and they both left me unimpressed.
GK2's biggest problem was the lack of interactivity, poor quality video (even back then that was obvious) and worst of all, bad acting. The story itself seemed like it'd be good, but with those other strikes against it, I had no urge to push my way through it.
GK3... well, the graphics. When GK3 was released, far better 3D graphics existed and it was painful to look at GK3. I couldn't go very far in it because of that.
MISC. GAMES
I despised
The Adventures of Willy Beamish. It was too temperamental and far too many choices led to a "game over" situation. I might have slogged my way through it if the characters were at least somewhat interesting, but they weren't. The average sitcom family had more depth than them.
I know a lot of people enjoyed
Conquests of the Longbow, but I never really liked it. Like other games on here, CotL wasn't a bad game -- I just didn't like it. Why? No clue. Maybe it's because I've never really cared for Robin Hood.
Codename: Iceman would've been good if the submarine part wasn't so damn difficult. I couldn't get past it and based on what some people have said, I probably didn't miss much.
Unfortunately,
Phantasmagoria was a huge letdown. It was certainly okay, but in the end, the game mechanics ruined it for me.
Finally... there's
Thexder. I don't mean to be vulgar, but... what the f*ck!? You can't even control your own character! You turn into a ship and fly in random directions, then hit a wall and turn back into a robot only to die when you've run out of energy because you were killing bad guys.