Oh also:
Halo 3:
The final boss and ending segment suck. Earlier in the game when you fight the giant crab mech thingy it makes you wonder what crazy thing they'll do for the ending.
Then you get there and it's a small flying orb, and a short ride with your Warthog through some crumbling platforms
Dark Souls 3:
While I love the improved combat, a lot of the bosses and it has some of the coolest areas in the franchise. It also feels very samey a lot of time, you can tell they were running low on ideas for new locations.
Half of the game feels like "been there done that". The ruined castle with dragons, the swamp, the catacombs, the prision like area, etc.
The Witcher 3:
I wish there was more in terms of build variety and customization. It's a great RPG in terms of story, but gameplay wise I feel like everyone had sort of the same experience.