Enterprise had competition for ending leaving you feeling miffed, pretty much within a few years. How about Lost? Even Battlestar Galactica had its share of disappointed viewers, who'd jumped ship from other shows they didn't feel were fresh any more, only to not really think much of where the story ended up. Something to be said for TV shows from the 60's, 70's & 80's that have no ending and no full stop that spoils the memories. Star Trek is different however, as a multi-series franchise where inevitably something will inevitably provide an answer to "Whatever happened to..." as the years go on.