I have a 13" 2012 MBP and the build quality is great, no complaints on it at all.
I had a 2006 MB and it wasn't nearly as nice, and as the white ones age they tend to show the wear more than the aluminum MBP's of any age.
I think the white plastic was a novelty when it was first introduced. It was different so it was cool, but I look back at those now and the iBooks and don't like them at all. Of course that's probably because when I upgraded to an aluminum Powerbook the build quality was very impressive. Same for the MBP's. I've never had a 17" one though to notice any creaks or problems like the other user is having.
I had a 2006 MB and it wasn't nearly as nice, and as the white ones age they tend to show the wear more than the aluminum MBP's of any age.
I think the white plastic was a novelty when it was first introduced. It was different so it was cool, but I look back at those now and the iBooks and don't like them at all. Of course that's probably because when I upgraded to an aluminum Powerbook the build quality was very impressive. Same for the MBP's. I've never had a 17" one though to notice any creaks or problems like the other user is having.