The weapons advantages differ in each map, eg- Adrift = BR, Complex =DMR, Solace = DMR, Haven = BR. My opinion anyway.
The thing with reach was each map was practically forge-made. In december there's a new map-pack being released, then another in february I think, then April.
The 1melee Is quite retarded, I agree. Usually in Swat, I would turn around and just shoot them, but now there's no way.
And ADRIFT is just luck based for SWAT, people just pop out and see you from miles away randomly, and shoot you.