Define "gamebreaking". Well I guess the definition is that it breaks the game, and in that case I'll have you know that I had no such problems. Sure as hell I've experienced a lot of weird, and sometimes annoying bugs, but none of them even came close to breaking the game for me in any way.
Game breaking is usually bugs who stop you from finishing the main quest or other important quests, An oblivion bug where martin disapear after entering cloud ruler temple is game breaking, you return to IC and do a lots of thing, then you return you can not continue the main quest.
Vampirism can not be cured on PS3, is a game breaking bug if you are not aware of it.
More dramatically the game crashes, reloading earlier savegames and doing different things also crashes the game then you level up or it become Sunday.
Un-patched Daggerfall had multiple game braking bugs, it was impossible or very hard to finish the main quest without breaking it: type 1. Savegames was not cleaned up for items you stored in your house and later sold, the result was that the savegame could be to large to load: type 2. Lots of other but this was the most serious ones.