Sequel game, same content... Yay!

[MetallicaRulez0]

The only games I can really think of that are too similar to their predecessors are the Madden series, the Tiger Woods series, and CoD:WaW.

Need i remind you about RE5 and Gears of War 2?

I was just going off the top of my head. I haven't played either of those games anyways.

 

[lostclause]

Yes things need to get changed for a sequel if they need changing. I point to mirror's edge as an example, good concept bad execution. It can be fixed and if the flaws are corrected it could be brilliant.
On the other hand you've got games which are almost exactly the same, GoW 2 and Halo 3. You could argue that they've perfected a formula but something new is always nice. Even just adding a bunch of new weapons.