wow. great thread. and at this time of the morning, good to keep an all-nighter going.
Im not going to try and remember everything that was already posted, but some good things to note..
Using Powerlines and Trees can be helpful when dealing with certain foes. Wolved, DE, many enemies have no effective ranged attacks, and if you're perched on a branch high enough, the will never touch you. Helpful if you have ranged attacks.
I wish Id known there is actually an exit in the train stations. I cant count how many times I would run into the exit thinking I had screwed myself. Pay attention to signs!
just my two cents