Took me a couple days to realise I could upgrade mods, and now that I have that's added an extra hook to offset the repetitiveness. Plus I never have any money anymore :p
Got my Excalibur to level 30 mostly modded for survivability, but no reactor blueprint as yet to expand it further, and too busy unlocking maps to farm for another frame's blueprints. Unlocked maybe half the map/missions so far, give or take. Currently sporting a rank 23 Strun modded for +45% damage, +60% multishot, and +45% fire damage, though I have my eye on +puncture, just not sure if I can fit it in (plus I could really do to improve its reload speed). Secondary is a Lex pistol, modded for damage, multishot, and armour pierce. I don't melee much - got a Cronus with +rate of fire and some other stuff, I forget.
For some reason since I switched from my Mk1-Braton to the Strun, my damage % in the post-match report has been significantly lower, even though I reckon I'm killing things as often and as fast. I'm still pretty newbie so my judgement may just be way off, but it never seems to align with how it seemed like I was doing during the match. Not that it really matters since it's all co-op and all, but I don't like to think (or look like) I'm not pulling my weight.