Unified ammo and the weapon crafting system make the game ludicrously easy, especially if you use the Evangelizer carbine. Slap a basic force gun underneath to repel anybody who gets to close, slap in +damage/+clip mods and you're golden. The thing will kill just about anything in 3-5 shots, less if you're accurate. Ended up with a 60 round magazine and 100+ magazines in storage.
That said, despite Isaac being capable of making a plasma gun from spare parts, he cannot make a better flashlight, let alone some shoulder mounter floodlights.
The 'ration seals' are just there to get you into the DLC store, and to check if you're an idiot. Can only buy 2 packs. One is 30, the other is 60. The 30 seal one has exactly half as many resources as the 60. You get 1 mark V component from the 30, and a 50% chance at 2. You get 2 mark V from the 60, with a 50% chance at 3........which means if you ever buy the 60 point one, you have failed.
Of course, they don't actually tell you to go into the DLC store to spend those seals, so their trick to get you into the DLC store also fails badly.
Combat is fun, though it basically amounts to "Shoot things in front of you, then turn around and shoot the things that spawned behind you. Every time."
The plot......well, as far as I can tell it was about what a bunch of idiots your team is. I found one of them frozen to death. The required action immediately after this? To walk around the corner and turn on the heater.
Bit of flat out stupidity are all over the place. Gas that burns organic material....which harms you, in your friggin' space suit. Multiple emergency plans that make no sense whatsoever. Death by stupidity, over and over and over again.
That said, I did still manage to enjoy it - but in a "Isaac Clarke, Spess-Mahrine!" kind of way. There certainly wasn't anything scary - not even cheap scary.