This is something that I, too, have been struggling with. While I don't condone calling any cache placement "lame" or "pointless" (obviously the placer had some reason for deciding to use that location -- whether it be the hike was over, the location holds meaning, or it is just where the cache landed when it was dropped), I do find that certain cachers think through their placement and have a definitive reason for its placement -- usually something any seeker will notice upon arrival at that point: sometimes it is just a serene enviornment, sometimes it is a fine view, sometimes, an awsome waterfall. Who knows.
Like I said, I have questioned this as well, especially around Harriman. I wonder about the concept of cache=trash. Sometimes, I feel like I have simply found a peice of trash in the woods, with some coords attatched to it. Othertimes, I feel like I've found something well worth an effort.
I have also wondered just how long one ought to leave a cache -- not necessarily to open the way for other nearby caches, but also to reduce the enviornmental impact that a cache naturally produces in an area.
That being said, I have contemplated removing my Shelters Series, since these areas are already abused by users.