yeah the worst ones aren't necissarily where something bad or weird happens (ME3) but sometimes just nothing noteworthy seems to (Vanquish, MW3, AC3)

Prime 3.

Samus acting all melodramatic and don't tease Prime 4 if the follow up is going to be Other M.

How was she melodramatic? She didn't break down and cry, or monologue like an insecure teenager like in Other M, she just took a moment to reflect on her fallen colleagues. She was calm and composed.

Mass Effect 3
Borderlands 2

There's a lot more, but those are the ones I remember atm.

Asura's Wrath, i just don't buy it!

finalfantasy vii, cloud didn't ask tifa out!!! :@ UGH

Zack & Wiki

The last four levels of that game are awful. The game only has 24 levels, so I guess that is not just the ending...

But it is baaaaad.

Most of the endings of the 8-bit-era (I especially remember Shinobi on Master System...) and the first Tomb Raider! The games was so hard to beat and the ending was so bad, I never touched it again...

Ha. I can't believe no one, NO ONE has mentioned Dark Souls. Seriously.

Those endings you've mentioned are nothing in comparison with Dark Souls' two endings. They're HORRIBLE. THEY'RE INSULTING. It's a slap to the face at the player.

One would think that after everything you went through, the ending would be the ultimate reward of the game. Or, at least, a good closure. WELL IT IS FUCKING NOT. It's a 15-second ending without text, without songs or anything (the "evil" ending at least has a small monologue, but pretty disappointing anyways.), without emotion, without anything. Then the credits roll. You wait, just hoping that after the credits, something goes on. But no, nothing - except that you're back at the beginning of the game (New Game +)-.

Mass Effect 3 ending is astonishing in comparison, my buddies. I mean, Dark Souls is probably one of the best games I've played, ever. But the ending is just plain disastrous.

Deus Ex
Dishonored
Batman Arkham City
Metal Gear Solid 2 and 4
Skyrim