Could be any number of things. Could be nostalgia, the people who were working there at the time/the studio's methodology, or maybe you just don't like how they make fps games in their engine.

For me, the big things are their lack of innovation and the lifeless worlds of their games from about Fallout 4 onwards. Starfield's procedural generation really showed just how average everything except for their environmental storytelling is. Without the little hand-placed tidbits to make the world interesting, everything else just kinda falls flat for me. Everything else about how they design games is outdated at this point and hasn't really changed since the days of Oblivion. Even their much vaunted spaceship builder turned out to largely just be a loading screen that you walk through between other loading screens.