Too much content in a sandbox or RPG seems like a somewhat silly complaint to me, so instead I'll say
Okami. It was a fun game, but when I beat Orochi after 25 hours of gameplay, I was kinda ready to see it all end. Turned out I was barely halfway.
Still a great game, but each new twist started to grate on me after that.
EDIT:
Yoshi4102 said:
Anoni Mus said:
Banjoo Tooie and Donkey Kong 64 sometimes felt a big overwelming.
I never played Banjo Tooie, but yes! Donkey Kong 64 has a crazy amount of content to it! It's amazing when it takes a relatively small amount of the total bananas to complete the game fully. Regardless DK64 is still a fantastic game and I'll love it forever.
Good point, I've been itching to replay Donkey Kong 64 for a while, but whenever I remind myself of all those times I had to backtrack the obscenely large levels to find one of the character-swapping barrels, I just let out a sigh and replay
Fable 2 for the eighteenth time instead.
Banjo&Tooie wasn't too bad, in my opinion, but I do agree that the tasks were less fun than in its predecessor, as well as requiring a whole lot more backtracking.