Why is Gollum (2023) considered one of the worst games of its year?

The Lord of the Rings: Gollum is an action adventure game by Daedalic Entertainment, released on May 25, 2023 for PlayStation 4, PlayStation 5, Windows, Xbox One and Xbox Series X/S. It follows Gollum between The Hobbit and The Fellowship of the Ring, hunting for Bilbo Baggins and the One Ring. It was a commercial failure, and Metacritic ranked the PlayStation 5 version as the worst game of 2023.
The scores explain the ranking. On Metacritic the game scored 38 out of 100 on PC, 33 out of 100 on PlayStation 5 and 43 out of 100 on Xbox Series X/S, all in "generally unfavorable" territory. On OpenCritic, only 4 percent of critics recommended it. Metacritic's worst of 2023 listing attributed the position to its gameplay, controls, visuals, bugs, and a requirement for extensive knowledge of Tolkien's literature.
The launch state was part of the story. The Guardian's reviewer described a game that felt profoundly unstable and difficult to play because of its many bugs. Digital Trends could not initially score the game at all because of persistent crashes, until a day one patch arrived, the first time that had happened in the publication's history. GameSpot's reviewer, in the site's later apology coverage, was noted to have had the game crash 120 times during the review playthrough. Reviewers also criticised the user interface and a perceived downgrading of Gollum's character model since the game's announcement.
Daedalic responded in public, twice. On May 26, 2023, the day after release, the studio apologised for the "underwhelming experience," saying it acknowledged and deeply regretted that the game did not meet the expectations it set for itself or its community, and promised patches for the bugs and technical issues. In June 2023 it went further: Daedalic announced it would close its development division, focus solely on publishing, and cancel plans for a second Lord of the Rings game, telling Polygon that Gollum "did not live up to the expectations we had for the game," while promising another patch and other positions in its network for staff being laid off.