I've been using snipers the whole time (in competitive too) and I don't find them to be underwhelming at all. Could do with some more sniper friendly maps though.
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Here's how I see it. If you want to know what the best is watch what the best players use. And every time I've watched a scrim match between iAm, BSK, God Squad, or any of the competitive clans, none of them are sniping. And that's even on PC where sniping is more manageable. The only streamer I see sniping a lot would be krafty. Other than that I just don't see it. Like even Sir D who's known for being a top tier sweat and sniper, never Snipes. That speaks volumes I'm.