Starfield (2023) Arguably the biggest and overall most disappointing.
Not sure what's happening with Starfield, but it seems the game is withering on the vine
The game on steam is shedding hundreds of players per month
My take is that Bethesda's stated (yes they said as much in an interview), that Starfield was intended to be Skyrim in space. Instead of 1 world to explore, we'd have over a thousand worlds to explore. The problem is that in skyrim you had POIs (Points of Interest) all over the place, you were rewarded when you walked and explored and avoided fast travel. With Starfield, each world seemed only have a one, two, maybe three POIs, and even then they were literally copies, the same buildings, the same enemies, the same things. On top of that, you have a crap ton of loading screens, its painful to travel in starfield.
I've stopped playing, I think I may have made it NG+ 6 maybe more, I've not played it for so long, I can't remember where I left off.
As for the DLCs, Todd Howard made it a point that he regretted the low DLC count for Fallout 4 and envisioned many more for starfield, yet it took a year for the first DLC to land and it was quite a bit smaller then any of the DLCs from fallout 4.
Far harbor was released 6 months after FO4 hit the ground, 3 months later Nuka World was available - two large DLCs in 9 months, where as Starfield's first DLC was 12 months and much smaller.
Even if the next DLC is significantly larger, I suspect it will be too little too late, especially since the studio has geared up to focus their attention on the next elder scrolls game.