Most recently, for me, it was The Outer Worlds. OW isn't a bad game by any means, and there were moments I really enjoyed it, but I kept thinking, the further I got into the game, is that it felt like a rough outline for an RPG, rather than an in-depth experience. It's like the mechanics, skills, companions, weapons/armor, loot just weren't fleshed out enough for me, and while the main story line was pretty good (with the DLC Peril of Gorgon being the best), it just made me want to get it over with and move on to something else after about the 3/4 point in the game.
For instance, companion banter, so important in a party-based RPG, was just lacking. They each had a defined personality, which is good, and conversations with my character, which took you to a closeup screen of that character, were okay, but it was while exploring the world when they talked to each other. I'd hear them talking, turn around, and they're standing like mannequins staring straight at me. Completely immersion breaking. I mean even Skyrim back in 2012 had npcs and companions look at each other when they talked together.
Then there was the weapons/armor and crafting system. At first it was pretty cool, because it was different, but the further I got into the game, the less variety there was, and there just wasn't much you could do with the crafting. Towards the end, I didn't even bother looting bodies or crates, as it was more of the same stuff I already had.
The level up system for the main character was okay, nothing in-depth, but just okay. But for companions, you had basically no input on how they developed. You got the choice of a perk every 5 levels, and that was it. Just no depth to it.
And don't get me started on companion AI. They just rushed every enemy, and either died, or killed most enemies before I could. Skyrim, FONV, ect had far better combat.
From this you might think I hated the game, I really didn't, I just wanted it to end.