SuperChurl said:
Mass Effect. Because there's no real resolution. You beat the bad guys, look happy, cut to credits.
It would have been nice, after crossing the galaxy theoretically affecting the world and people around you, to actually have... I dunno, something. Some kind of epilogue, or a debrief with your crew--an afterparty, even. For a story-centric game to just cut everything short 20 seconds after beating the last boss is a big build to a big nuthin'.
Ah well.
If the first
Mass Effect game was a stand-alone title, that'd definitely be a serious issue; the whole story spanning three games is enough reason to let that slide. Then again, I didn't finish (or really even play too much) ME1 until I had started ME2 and decided to finish the first game so I could import my character; so ME1's lack of a good denouement after the final battle was overshadowed by my impending playthrough of ME2. Speaking of which, ME2 allowing to keep playing the game and talk to your crew about the final mission after it takes place was a good way to avoid the suddenness ME1's ending.
---
Back to the general topic question, I'm actually surprised that original ending of
Neon Genesis Evangelion hasn't been mentioned too often. While I enjoyed that ending myself (quite different from the usual sort of ending, made the series FAR more memorable than it would've been otherwise. Nevertheless, the ending has a well-deserved reputation; the style of the final two episodes are such a sudden shift from what preceeds them, not to mention they're intensely introspective (simply not something everyone gets, let alone enjoys).
The reasons why this shift occured are tough to track down (I think this is the best explanation for it), but pretty much it boils don to the television censors in Japan outright refusing to show the planned ending; the series was pushing (if not exceeding) of what could be permitted in it's time-slot (mecha show? children and young teens is the usual target audience here) in terms of violence, and the refusal to broadcast the planned ending meant that Gainax had to come up with something more acceptable FAST. The budget didn't run out, but there just wasn't enough time to do anything better than what was in the broadcasted ending.
The planned ending did get made however, in the film
The End of Evangelion.... yeah, definitely not an ending you want to put on television (particularly for what was aimed at young teens). The film was supposedly rated NC-17 (as in ABOVE the standard R rating) at some point. Anyhow, this could be why NGE's (original) ending hasn't been mentioned too much; the series was followed up with it's proper conclusion (not that everyone liked EoE either).
---
Falling off course again, I have an ending I disliked:
Halo 2 -- Mentioned repeatedly already, and it's the perfect example of a really obvious sequel hook. "Finishing the fight" -> Credits start rolling. What.
Other than this, there are no other games/shows/whatever which spring to mind about having a bad ending. They're usually not worth remembering, or I never get through to the ending for some odd reason. For example, I haven't got around to finishing DA2; I lost interest after finishing the first act. I (mostly) enjoyed the segments of the game I did play (the eerie atmosphere of the Deep Roads expedition was great), but I can't muster the interest & drive needed to come back and finish the game.