dtgreene: Worth noting that Bethesda games, or at least main series TES games, have generally improved in terms of bug density over the years.
Arena has fewer bugs because it's simpler, but it still manages to have quite a few bugs lurking about, some of which are just embarassing. Like being able to easily levitate out-of-bounds in a town, causing the game to hardlock.
Daggerfall is buggier than Arena, but that can be explained by the game being more complex, and hence a much bigger bug surface. (For example, Arena's mostly 2d gameplay meant that falling through the floor and into the void would not happen, but Daggerfall being fully 3d allows that possibility. Also, the new skill system is a ripe source of bugs.)
Morrowind isn't as buggy as Daggerfall. There's still falling through the floor (except that the game will teleport you to a reasonable spot in the room when that happens), and I've had the game crash when getting a Cliff Racer to fall from up high into a city, but not as bad as Daggerfall. Also, the game handles the situation of no playable races, something not possible without modding, without crashing.
Oblivion, in turn, isn't as buggy as Morrowind.
I don't think I even had Skyrim even crash once. (Worth noting that disabling the player via the console, which would crash Oblivion, isn't even allowed in Skyrim.) I haven't fallen through the floor, either. An NPC did once fall through the floor when I wasn't here, but after using the console to teleoprt her to where she should be, her AI script started working properly again.
Just became a game doesnt crash doesnt mean its not a buggy mess. Skyrim back on release in 2011 had things like dragons flying backwards and got alot of shit from the community, the saving grace being the modding community being able to fix many of the biggest bugs within a month or two for PC. Fallout 4, which was released in 2015, was a buggy mess that has eventually become good (although not as good as 3). Fallout 76 was also a broken mess on release infamously.
Its a general trend with Bethesda games. Initial release will be ridden with bugs and will be playable thanks to mods. After a while, the bugs will be fixed and the game becomes what it was meant to be assuming support doesnt dry up. Starfield is going to be a buggy mess on release. With enough support, it will likely be fixed and become a good game since Microsoft has alot riding on it but I dont see it being a smooth experience right out of the gate based on the studio's history.