Let's see. I've only played Kingdom Hearts 1 and Metroid Prime 1 and loved both of them. I will play the sequels eventually, I have all of them. Actually I am pretty sure I have bought Kingdom Hearts 2 like 3 times and still haven't played it.
And maybe Assassin's Creed whatever cause there are too many. My last one was Brotherhood? Can't remember. God I used to love the story in those games. I wonder what is going on in the most recent entries lol.
red dead redemption 2. well i played it for a few hours but never went back to it. such a disappointment since i had been waiting years for it and was super hyped. i just found it tedious boring. if they release a PC version i might give it another shot and take another approach.
i loved the original game. Its the reason i bought a 360. For some reason, i guess i had my fill and never felt the need to play Gears 2.
I think sometimes what happens is that a game gets a bunch of sequels. And u feel like u can't go back. So why even bother. For a long time i never had played Halo 3 or Uncharted 3. Despite the first two games in their respective series being faves of mine. Recitified this in the last year.
Batman Arkham Asylum and City are maybe top 10 all time games for me. But i steered clear of Arkham Knight. The reviews made it sound terrible. And any gameplay i watched always had that tank and it didn't look like what i want in an Arkham game.
Somehow i haven't played MGS V. Even tho snake eater is my #1 fave game of all time. And i was in the camp that liked MGS 4
Castlevania: Lords of Shadow 2. I liked the original pretty much, but when the sequel came out I read some complaints about newly introduced stealth sequences, and not having enough money at the time just sent this one into oblivion until a couple of months when I found it in the bargain bin of a local store. I'll give it a chance at some point.
I loved Metroid Prime for the GC. I was a little bit disappointed by Metroid Prime 2: Echoes. And since I never owned a Wii or Wii U I never played Metroid Prime 3: Corruption.
Another one is Baldur's Gate 2. I always wanted to play BG1 and BG2 back to back and use a BG1 save game for BG2. But since this is such a time consuming endeavor I never played BG2.
Maybe I should just play BG2 without repeating BG1 beforehand.
Gears of War 2 is great. It is much more fleshed out than the first game which often felt like a prototype / proof of concept to me. I missed the darker setting of the first game but overall it is a much better game (imo).
Resident Evil games. Loved the older games but as graphics have gotten better, the games have gotten gorier and I've gotten more particular about what I play, I've stopped playing them. If they ever release a content filter option, I'm there for RE2make and RE6-7.
Mass Effect Andromeda because of how it turned out
Red Dead Redemption 2 because nothing interested me there
Dishonored 2 because I bought but had problem and had to cancel but then I never bought but still need to do
Outlast 2. It's in my backlog, but I've never got round to it yet. The original was one of my first experiences on PS4, and the console wasn't inundated with games at that point. It's just been harder to fit the sequel into my playtime when the new releases just keep on coming.
Loved metal gear solid. Beat it when I was in high school. Saved money, traveled in Europe, went to college and didn't own a new console til ps3. Totally skipped ps2. I actually own the mgs collection for ps3 but I've never tried it. I kept putting it off and then just never got around to them.
Same with mass Andromeda 3. Bought the collection for ps3. Played the first, actually wrote about the second for a class in grad school, and then never played the third. Not because of the controversy; I just took a break and meant to get to it and never did.
Not the most exciting answers but mgs and me2 are some of the most impactful and fun times I've had gaming but I didn't continue the adventure. Uncharted on the other hand I did finish and I really loved the ending to UC4. I thought it was such a special and touching scene.