Why is the Scar light considered a noob weapon now?

I used to see a lot of people tell me "buy and Scar light, it's a pretty good gun", i surely could see that, since it had nice stable aim and a really good power, but now i see people QQ about it, i mean what up with that? Now every person i see tells me that the Xm8 is the best gun now, can someone clear this one up for me?

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