There already is a radiation level meter, you just have to buy it. And even when I did, I only used it once (travelling through the dead city, as I was too stupid to figure out you could just reach 100% rad resistance with 2 rad-x pills).

Someone else already mentioned how to pick locks, but I think the lockpicking skill should be nerfed. With a lockpicking skill of 70-75 at most I picked every single lock in the game, the vast majority of them without using the lockpick and crowbar too. And the whole "you failed to pick the lock" thing makes no sense, you just have to keep on clicking until you succeed. There being a chance of breaking the lock and making it impossible to pick in such situations would sort of make sense, but in my case it would just encourage savescumming extraordinaire.

I didn't really go deep into the NPC commands besides healing them, throwing guns and ammo at them and telling them to run away/stay close/wait here (although poor Fidel didn't even live long enough to get his first gun). I don't know if other companions are more reasonable with their ammo, but Hexogen just spends all the ammo on him in 2-3 encounters tops whenever he has an automatic weapon on him. Plus he uses burts from his MG to take down flies and rats.

There should also be an option to skip ridiculously weak encounters too. When my travels get interrupted by a bunch of wasps and rats which are incapable of dealing any damage at all unless in some very, very lucky criticals when they manage to take down 1 or 2 HP at most, it's just annoying. Even without the fact that Hexogen will spend half his ammo on them. The inhabitants of the Dead city are also like this, but the chances of avoiding them by using survival are much smaller too.

And the survival skill itself makes little sense (except on survival difficulty). Why would I waste skill points to increase the chances of avoiding an encounter altogether when I can throw them at any other skill (except for the utterly useless stealth, but I'll get to that in a minute) and increase my chances of surviving the actual encounter. Running away is pretty easy, and I have rarely encountered enemies which could kill me before I could run away if the situation called for it. Healing resources and food are also plentiful, so you are likely to be able to heal any damage you took immediately after you run away or win.

Now for the stealth. I know that it wasn't very useful in the original Fallout games either, but at least there were situations when it came in handy (sneaking past Bishop and his men after boning his wife or daughter comes to mind). At least you could activate a stealth mode and sneak around. The stealth in ATOM is solely for remaining undetected while stealing shit (although I'm open to the possibility that I'm just retarded and didn't figure out how to activate a stealth mode). And as someone who poured quite a lot of skill points into stealth at the early levels thinking it would actually help me sneak up on people, I found it quite disappointing. You'd think that since stealth in ATOM is all about stealing it would cover pickpocketing as well, but pickpocketing is a skill of its own! Which I haven't tried using even once so I won't say anything about it.

Also forgot to mention, aimed shots don't really make much sense if you can't cripple limbs. The only similar thing in ATOM is blinding, but I didn't notice any dramatic consequences to it (I still had a 99% chance of hitting anyone next to me with a machete).