The egg that's on Rockstar's face has more to do with how much money they likely left on the table by not diagnosing and fixing this issue early on. (And assuming they had a team overseeing this aspect of performance with adequate tools to observe and debug it should have been trivial.)

I personally feel like the magnitude of this -- especially compared to how simple the solution is -- makes it a miss that's really much more extreme than most others.

EDIT: Though I agree that "shameful" isn't the right word to use. Rockstar wronged themselves much more so than any other party.