No one is slating LG's picture quality. People just prefer Samsung because they are the most popular, sell the most, best documented, etc. I have seen plenty of excellent LG plasmas. Oh, apparently Samsung menus are better. Must say, the current Samsung plasmas' housing is fantastic, as well as build quality.
Fact of the matter though is that getting a dud that breaks soon is totally luck of the draw. Really says nothing about the brand. Sure, after-sales service does, but perhaps there is a legitimate reason for it? Often if you simply speak to upper management, you will always get your way.
At the end of the day, LG and Samsung palsmas are both great, equally as good most likely.
Samsung's service and quality in PC LCDs is definitely superior to LG's, I guarantee you that.