The only reason it's always singled out as the most "op" weapon is because it's the easiest gun to tell you got killed by. The last word and red death are just as common but don't get nearly as much hate. I'm sure if they turned your screen green they would. Just my 2 cents.
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I saw a spreadsheet posted yesterday that had every weapons stats posted. There are blue weapons with a faster TTK in PvP. I'll link it here. I'm sure the crybabies will still try to argue it though. https://docs.google.com/spreadsheets/d/tTMPEAOhYplzPIA4B07pBhQ/htmlview?pli=1