I think they are fine didn't change a thing, you happen to get a bad one, you read on the forums about people with issues, that's why they come here usually
Apple hasn't "fixed" or changed anything if they produce 100,000 units, I'd expect at least 1000 (1%) to have some issues, heck maybe even more like 5%, no clue what the real numbers are. Everyone that gets one with an issue is going to Google their problem which leads them to a forum where it appears "the sky is falling". The issues get blow way out of proportion and we end up with all sorts of "OMG don't buy the 17" UMBP!", "I found out from 3 different forums the 17" UMBP are trash!", "WARNING DO NOT BUY". Frankly it's funny as hell how no one seems to look at the big picture and realize how biased the information is they are reading on tech forums.
They sky isn't falling, you just happen to get one of the few bad ones, it happens, I'm glad Apple took care of your issues, but no need to Hype it up anymore then it already has been and will be