ok here is a list of how many weapons I commonly use out of each level, as you can see it is no where near the amount of weapons in each level so adding more weapons to each level will not change that.
level: amount commonly used
1: 0 (I don't think anyone commonly uses level one weapons other than starting with the recoilless)
2: 2 (this one has some nice choices, I commonly use fast fire laser or dual laser)
3: 1 (omni laser, I would use turbo laser but dual laser works better for me)
4: 1 (dual turbo laser, by then I want to get away from omni weapons and dual turbo laser with enhancements is a great weapon)
5: 0 (I don't know I love the x-ray but maybe its coming to late in the game now, the other weapons I don't care for)
6: 0 (TeV 9 blaster is a good weapon but by time I can get it I am already into level 7 weapons)
7: 2 (both dual TeV 9 blaster and Hanzo blaster are good weapons)
8: 1 (Fusionfire howitzer, I don't know I just love this weapon

)
9: 2 (Ares archcannon is good for old times sake but doesn't nearly preform as well as I would like, Qianlong archcannon for killing the last boss)
10: 1 (plasma cannon a fun nicely balanced weapon)