The definition of the term "gamebreaker" differs by user because each user has different priorities. Some only play online, some only offline dynasty, some favor running, some passing, some playing D. And we all have differing knowledge and skills.
I try and respect other viewpoints.
As for me, I consider my first OD locking up to where I can no longer open the file an irrefutable "gamebreaker". I consider having to play on Freshman level to mute the super DB's pretty damn close to one. In the end, I figure any recurring issue that makes me want to break the disk in half PROBABLY qualifies as a "gamebreaker".
Literally.