Nymeria on 09 March 2018
The Cell processor. Over all it didn't add much of an advantage over a year older 360 and made ports tricky even today with backward compatibility. If the PS3 was essentially a 360 inside and launched closer in date and price they would likely have been far more competitive early on and made a profit on a system.
Controversial one is not putting online play behind a paywall from day one. Stinks for gamers, but PS+ has been huge for the stability and growth of their gaming division.
