Honestly, Stargate Atlantis didn't end too badly. It's now on Earth and Earth is a force to be reckoned with finally (SGC's original goal was to acquire new alien technology, and now they have a whole alien city that is cloaked in SF bay). They really just need a new series that merges SG-1 and Atlantis, but I'm guessing most of the actors are a bit too old now (hence, the mess that was Universe, but I still enjoyed it despite its teenage love-triangle bullshit). The two that I wish had endings were: Dollhouse, which got really amazing right at the end but never really finished (a Joss Whedon production, check it out!). The second one was that they tried to remake that old 70s show called Battlestar Galactica in 2003. They had a 2 episode miniseries that rocked and then they didn't get picked up for a TV show unfortunately. It could have been amazing.