Yep.. It actually is annoying when you have THE best phone in the market - but a ty keyboard. I am an ex-HTC user which, in my opinion, has THE BEST smartphone keyboard out there - no competition.
Yea SwiftKey is unbelievable, but there is SOMETHING about having a GOOD STOCK keyboard rather than downloading one. I mean when a phone is this good you want everything to be stock-Samsung...but alas, I guess we have no choice but to go for SwiftKey, cuz like you said - the SGS3 truly does have the WORST keyboard out there!