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The only way to get that GOOD gear in the past was gearing up in heroic dungeons, and then getting in raiding. Now, all you have to do is hit "queue" and get into LFR, which is essentially the same raid but with zero rules, no raid leader, no mechanics, no anything. So, no, no one says "I've beaten the game because I've been carried through LFR." However, there is a hugely negative impact when those who would have initially taken the time to learn their class, get better, and take the dive into real raiding choose NOT to because they can do LFR.
This doesn't apply to those who don't have time to raid or scheduling issues or whatever. This is strictly for people who now don't want to take the time to learn to play and get into a guild and raid for real, but instead just hit a button and do, as Blizzard says, a scenic tour of the content they created. Granted.. Blizzard spends so, so many hours and tons of money creating these raids, they want all 7 million people to see it. But, once you take the exclusiveness away, the feeling of WANTING to get better at the game and learn your class to EARN better gear goes out the window for a lot of people.