Did you seriously just resurrect all these old threads and post the same message in each? One would have been fine.I had the same problem with (4) machines from December 28, 2014 - February 10, 2015. The screen is completely unacceptable, especially if you are a graphics designer, video editor or gamer where you work with dark backgrounds. The screen bleed problem is very distracting to look at.
In my opinion, this system needs to be revisited by engineers. It's not right to put the customer through this hassle of exchanges, delays and inconveniences where these issues should have been noticed/fixed in pre-production by Apple Quality Control Engineers.
Which model did you get? You went through 5 replacements? Like advance replacements or you had no computer while you waited?If it bothers you, return it for a replacement. If the next one has more or the same bleed, keep exchanging it. It took me 5 replacements until I got one with zero backlight bleed (except for unavoidable IPS glow). You may not be as lucky as me though, so you may have to live with some amount of bleed.