The endings of both Portal games were superb, particularly the first one.
I found the ending of The Witcher 3 Blood & Wine expansion extremely satisfying. After spending all of that time with Geralt exhaustively slaying monsters, putting up with racist redneck villagers, genocidal priests and him sounding thoroughly fed up and knackered throughout it was good to leave him with his feet up in the sun on a bench in his own vinery in the gorgeous Toussaint countryside with his lady at his side.
I was genuinely gutted when all I got was a short cut scene before being asked if I wanted to load my previous save. The whole time I was looking forward to exploring the rest of the map once I had completed my quest and there was fuck all. I'd loved nearly every minute of the game but that was a real letdown.