I heard someone said that the Assault Riffle is "OP". I would like to heard a decent reason, since it works best on close-quarters combat. This doesn't seem reasonable since there's too many people carrying a Boltshot, which can turn the tables unfairly fast. Since it's a CQC weapon, it can't respond properly to over-used DMR and BRs.
Then again, people should know this, and should play accordingly.
Besides that, I think that the Boltshot, the Incinerator Canon, and the Binary Riffle are "OP" (though, the binary holds less ammo compared to other snipers).