I recently picked up a 336 for $300. The ejector was missing, but it cost $20 for the ejector which the vendor kindly reimbursed me for as he was unaware that it was missing (estate sale). I'm very impressed with how easy it is to disassemble and clean. Incredibly simple mechanism. Nothing to it, just down load the owners manual from the Marlin website or google "Marlin 336 diassembly) and off you go. If you want to scare yourself, google diagrams of the internals of the Savage 99 or Win 88. (I'm not criticizing the Savage 99, I love the lines of that rifle and one in 308 is on my short list).
I had some issue with accuracy when i first got it, but i realized that the magazine tube was out of kilter and putting a lot of stress on the barrel. I VERY,VERY carefully put a couple of VERY SMALL bends in the tube to get the proper clearance and make the magazine tube essentially free float and poof, much better.
I also had one misfire, so I dismantled the bolt (five minutes) cleaned out a lot of gunk, oiled it up and works like brand new.
It was also nothing to throw a scope on it as it has the solid top receiver. Originally, I wanted a Win 94, but I picked up the Marlin almost by accident, and love it.