After a couple weeks of this game I still totally love it and am totally lost in the grind/gameplay loop. I'm starting to get a little jaded by constantly switching out weapons tho. I'm always using lower ranked weapons to keep my MR bar moving which means I never get to settle into a weapon or gameplay style that I like. Some of my favorite feeling melee weapons so far have been Orthos and Scindo, but I just maxed them both and then sold them because they're essentially MR fodder. Eventually I'll get the Prime versions, that will be "keepers" and they'll finally be worth sinking a catalyst into and maxing out, but for the early/mid game it has been a lot of hump em and dump em with weapons and that's been a pretty crappy feeling.
Another thing that's bumming me out is all the ways the game is nickle and diming with f2p stuff. Like I can't collect frames without slots. And then on top of that collecting and even maxing them out is essentially pointless because a reactor is mandatory to make them even come close to comparing to my Frost Prime (it's probably unfair to compare them to a free prime/reactor'd frame, but it's their fault for giving it to me!).
That last part will easily be remedied once I get a plat discount, but I'm starting to get convinced that the more hours you sink into this game, the shittier your daily bonuses are because they know they already got you. I'm eventually going to have to break and get some plat, I just won't be able to go nuts and get the whale-tier package until they give me a fat discount.