Much of the art of an FPS is level and weapon design. You've generally got about 10 weapons, and they mostly all need to have their own "feel". Borderlands of course goes crazy, but gets away with it. So far in Starfield - with the big caveat that it's not like I've unlocked much - is that already it seems like weapons are a mostly formless mush of stuff, except without Borderland's gonzo-fun aspect.
As for level design, well, proc gen. It's hardly setting you up for genius.
I mentioned above the research / crafting / levelling. You've got about 5 different spheres of skill, each of which has what, ~20 skills? And each of those skills seems to have four ranks. This mostly just seems overwhelming. Level up, here's your one skill point. It feels like the skill point doesn't do very much, and then what the hell do you spend it on with so many options? In most RPGs, you have a clear vision of what you want and need, but this is harder to do in Starfield.
Then the research... ugh. Research fucking everything, in minute detail, and yet there's so much to research in such small steps it simultaneously feels weirdly... pointless? Congrats, you can now mod your gun to do an extra 10% damage. Another 4 research levels and upgrades, you can mod it to +50%. And you'll need to research that (presumably) multiple times on different tech paths for different types of weapon. Oh my god.
Levelling up and researching often feels ace because it allows you to make big decisions for your character - that excitement that you can unlock X or Y. The problem with the granular approach Bethesda have opted for is that it feels a little like it's now turned into a grindy chore.