Pokemon games keep adding and taking away features with every game, instead of building a monumental and definitive game. The same with Mario Kart.
The thing about creating "definitive" versions of a game is that you end up forcing yourself to go over the top with each new entry of the series. Not only does this make older entries obsolete over time, but the series as a whole becomes stale and more predictable.
With games like Pokémon and Mario Kart, you can always revisit the older entries and appreciate what makes them unique. Their replay value does not diminish with each new entry because adding more and more feaures and polygons is not Nintendo's means of keeping a series interesting and fresh. They resort to more creative solutions.
- Inconsistent checkpoints
- Roadkills from incredibly slight pushes by vehicles
- Poor weapon balancing
Halo 2 and 3
- General campaign theme shifting from mystery/exploration to generic sci-fi action (Props to 343 Industries for bringing the former back in Halo 4)
- Game-breaking bugs
Star Wars: Knights of the Old Republic
- Tedious boss battles
Jet Force Gemini
- Bear collecting