I wanna play it on my second playthrough but all I'm hearing is it's a bullet sponge fest and nothing else
thats a sign that you are underpowered or undergeared. Survival means no bs, your build and your perks should be picked to maximize your combat efficiency over roleplaying. I would suggest trying Hard or Very Hard first to get a feel of the increased enemy health and damage, the bump up to Survival is not that big, but the slow healing is.
Survival mode also decreases the speed of stimpack healing or so I've heard. Since i've never played one of the lower levels I couldn't tell you about them but in survival mode it takes a while for a stimpack to be fully utilized
I took the medic perk and I regret my decision. Stimpaks heal like normal difficulty and the 100%. Makes it a bit too easy.
I'm hoping the first DLC we get will be balanced for extreme high levels of play, like 80+.