Jak and Daxter.
Yes, I said it. I loved the first game, with its lush, green forests and its old-school platforming gameplay done so incredibly well. Not to mention the game world itself:
No levels. No loading times. Just ONE SINGLE LANDSCAPE, constructed in one single piece.
Yeah. Seriously. No levels. You didn't get to the final boss by making it through a series of variously-themed obstacle courses. You got to the final boss by TRAVERSING THE ENTIRE CONTINENT, from one end to the other! The whole game is a single, seamless journey - through forests, jungles and gloomy caves, up snowy mountains and across fields of boiling lava! That provides a uniquely epic feel that no other game can match.
And then, the sequel came. As most of you know, Jak and Daxter 2 is set in a grimy, futuristic city with heavy traffic, dense crowds, police everywhere - and guns. Yes, guns. After the primitive, down-to-Earth feel of the previous game, we suddenly get guns. J&D2 is basically a slightly more cartoony version of GTA. Jak was still very much a platform hero, Daxter was still funny, but I just couldn't get into the game. The gritty, urban feel was simply not what I wanted from a J&D game.
I missed the jungle.
AND there were loading screens.
I never bothered to finish the second game. And since the third game was a direct continuation of the story, I just gave up on the series right there.