I believe it is all about getting comfortable with a weapon then just staying with it. i am still working my way to max lvl because i am an adult that works a minimum 40 hour week and parent that also demands some of my free time so in the climb as i receive a higher weapon i use it until i get something of equal lvl i like more or i get one that is higher. this has been kind of fun kind of frustrating there fore learning what works with every weapon type diversity is what Bungie is after trying to get ttk closer across the board so people that like different load outs can use them and still be effective. i have used many many different things in D2 as compaired to my three years in D1