It seems im having a completely different experience to everyone else in that im enjoying playing through the story and exploring, the combat isnt amazing but in not getting frustrated with it. I'm playing on hard and im not finding the game too difficult, i can actually play a lot more relaxed now but at the start i was taking my time and relying on stealth and turrets. I have combat focus fully unlocked so i dont even have to look for mimics anymore, I can just clobber them when they make an appearance without taking a scratch. I dont use weapons extensively unless i come across an enemy the requires them such as the electric phantom mentioned above. There were a few points where I almost ran out of ammo for my guns after coming across a lot of the harder enemies in a short time but after that happened I built up an ammo reserve so I wouldnt have issues again. The wrench for the most part does the job even though i havent invested into the wrench skills(Its on my list of skills to buy).
A small tip for those starting out: You can get away without investing in the strength abilities for the most part by using recycler charges on objects you want to move.