Good:
Farscape - It's obvious that Sikozu, D'argo, and Grunchlk are all alive, so they didn't really provide absolute closure for every avenue of the series. But that was forgivable since the creators were vying for a revival and the "ending" was pretty good even though the moral of the story felt like a rehash of the hippy bullshit about nuclear weapons.
Bad:
Sliders - I'm just gonna inject this syringe into my blood stream and disappear forever now. See ya!
Star Trek: DS9 - Cisco's some kinda prophet now and Odo's buried himself in splooge? What the fuck!?
Star Trek: Enterprise - Oh my dear lord in heaven--NOOOOOOO!!!
Alien Nation - The movie's could have been great if they had simply addressed the original problems the series had with its preachiness. Not to mention they tried to reinvent the setting by making Kathy more militant and turning George's wife into some kind of separatist cunt.
Frasier - So he leaves Seattle to board a plane to wherever this swindling matchmaker tard decides to move and yet the show is so unsure about the decision that it doesn't actually confirm that he's gone to California. Fucking brilliant, assholes.
Quantum Leap - "God bless you Sam." Fuck you! Fuck YOU Bruce McGill!