TLW is not fine IMO, I really dislike that gun. And it wins in almost all scenarios. It takes down Shotgun users too at close range. It's like we have so many exotic, and only two are used. MIDA and TLW.
The reason that those two guns are so heavily used is because they are the best at countering the two best special weapons. TLW counters shotgunners and MIDA counters snipers. Remove the unlimited supply of special and watch how the meta changes. TLW struggles anywhere out side of about 15 feet because it requires 5 body shots or 4 headshots which is hard to land at further distances. MIDA is great for counting snipers because of the RoF and flinch.
Each primary weapon class has good to great weapons. DoP is a great counter to TLW, pulse rifles are great for countering MIDA because of the burst flinch and how their ranges are.