We just recently used a 30-30 marlin for a hog hunt over dogs. It was my wifes hunt and the little marlin fits her well and is very light on recoil. At the very close range of hunting with dogs the 30-30 is almost too powerful. It killed every pig instanly including a 200lb sow. The bullet entered the temple and went all the way through the head and down through the far shoulder blowing out lots of bone and meat. It made me respect the power of the little round even at close range. Her shot was only about 10 yrds away, but it was impressive.
My uncle in Oregon, that has always lived a very modest life has hunted roosevelt elk in the timber for years. He usually bowhunts, but when he took a gun, it was the only one he had, a winchester 30-30 that he killed elk with each time he used it. I surely do not recomend it as an elk round, but for the close timber work with good shot placement, he did just fine.
I think that for a woods deer rifle with decent ammo, the old 30-30 lacks nothing. I personally would use something with more punch, but I will never think a 30-30 is not enough for deer when used at resonable ranges. The feel of a lever action 30-30 makes most bolt guns seem awkward too.
Good shooting,
Brian