I can handle "what did that actually mean?" types of shows, but only if the mystery had some internally logical consistency to it, i.e., it's not just a mindfuc

I can handle "what did that actually mean?" types of shows, but only if the mystery had some internally logical consistency to it, i.e., it's not just a mindfuck for mindfuck's sake. A good example would be early-series Lost: lots of interesting mysteries left open to interpretation, giving the impression of more to come, and of a consistent logic to the way things were going to unfold. Bad example would be late-series Lost: it became pretty obvious they'd written themselves into a corner about halfway through the series, so they started making up increasingly convoluted ways to tie it all together, eventually winding up, as far as I can tell, somewhere in the Dr. Who universe.