What reaction are you talking about? The only people overreacting are the ones joking about canceling their PS4 orders. Most everyone else is saying, well, that kinda sucks, but it's not a big deal and should probably be fixed in a firmware patch.
If there weren't four times as many people telling people not to freak out, when no one is actually freaking out, this thread would only be a handful of pages long. Instead, posts fall into several categories:
1.) Drive by sarcastic quips.
2.) People wondering why everyone is freaking out.
3.) Dumb suggestions on how to cover up the light.
4.) People being reasonable and saying they'd prefer that their controller didn't glow constantly, but that it's not a big deal.
and 5.) People arguing whether that's a reflection in the video clip or not.