I started Geocaching in 2007 with a friend. When he was showing me how to log finds and fill in the logs, he specifically told me that we should always be adding TFTC, and a reference to whether or not we took anything TNLN. Along with these i should add a time of find. But that was it.
I'm just restarting caching on my own (the friendship didn't last and with no GPS i couldn't cache in the interim) if i hadn't seen this thread i would never have known that the above was actually considered bad form when writing a log, and would have carried on writing them this way, because i was under the impression that this was the accepted norm.
If cache owners expect more details on logs I would find it really helpful to have a guide (maybe in the FAQ section) that tells me (and other newbies) what we should be writing, maybe something very brief with bullet points that could be printed off and carried in your caching bag. Or maybe the cache owner could put a brief note in the description saying if you have the time please leave a longer log, saying what you liked/disliked about the cache, how easy/hard you found it, what your impressions of the area were, etc. I dunno whatever you want people to talk about.
I'm a writer and photographer so things I always have with me are a compact didgital camera (and often my DSLR), an A6 notebook, and a handful of pens. If i knew what cache owners wanted i would quite happily get my notebook out after finding each cache and scribble a few notes to type up into a log when i got home, maybe take some pictures.
But with pictures i'm never sure what it's acceptable to show in a photograph taken at the cache site (but that's another topic)!!
So please don't generalise that we're lazy cachers just becasue we post an abbreviated log, it might simply be that we didn't know any better even after reading all the guides and things. As to deleting a log that just has TFTC, i would be really upset if someone did this to me, i think (like someone said they do) you should at least email the person who logged the find and explain that you'd like to know a little more about their find, at least give them the chance to edit the log before deleting it.