Mass Effect had a massive ending (which was effective).
Sorry I'm all hyped up, I just beat Mass Effect and ---no spoilers, trust me--- the ending was just fantastic. The whole game was, but I was very impressed with how they treated the ending.
At one point, the game started getting intense, and I knew the game was at its end. But it just kept going, and kept getting more and more intense. And now thanks to that, I'm all adrenaline filled!
Well, I won't say anything else so I don't give anything away. Just go play it if you haven't.