Hi, it depends on what you mean by "normal". If by normal you mean that "most" MBP 17" will have this problem, then I would say yes, as I had to go through 4 of the same 2011 17" MBPs to get one with a perfect backlight (as in no bleeding). And even then, it exhibits this heat-related problem (which apparently all MBPs do): https://forums.macrumors.com/showthread.php?p=12733694&posted=1#post12733694
As with the iPad, I think that MacBook Pros are amazing products, but their screens are total letdowns. Apple should invest in some better solutions and finally get rid of the TN technology and LED Edge lighting in MBPs. IPS + LED Backlit would be great.
howed you get 4 replacments? they wont give me one for my issues >(