There are a lot more variations to have in the story, other than the basic Iorveth/Roche decision. I finished my 10th playthrough the other day, and for each playthrough I've brought fresh ideas and concepts with me, to make them feel less of a repeat. Some involve importing a different save from TW1 (I loved meeting Siegfried outside Loc Muinne!), while others also involve first coming up with a character concept on how I should let Geralt relate to various situations I meet in the game. It is true that you don't always see immediate effects depending on your decisions - most of the results seem to be saved for future instalments (be they DLC's, expansions, or even TW3), but you still get a sort of wrap-up of what you can expect, during the final moments of Act 3. Most of the 16 endings of the game relate to who is alive and who is dead, and you should never underestimate the effects of having a powerful king such as Henselt killed, or what the pact between the La Valettes and Nilfgaard might bring to the table once the inevitable invasion begins, if you killed Aryan. Likewise, the consequences of having Letho implicate the sorceresses for the deaths of Demavend and Foltest, are much more severe than if you instead rescued Triss and had her bring forth evidence of Síle's involvement. Sure, chaos ensues in Loc Muinne no matter what, because of the dragon, but even the journal hints to how the coming witch hunt will be much more bloody and brutal, if Triss hadn't stepped forward to clear things up.
One of my favourite story choices in the game relates to Anais, actually. If you partnered up with Roche, she can either be given to John Natalis or King Radovid, or have Roche take her somewhere far away and protect her until she comes of age and can return to reclaim the throne. Apart from what is clearly stated in the game, you can tell that the consequences of either decision will be incredibly profound.
Two playthroughs (one with Iorveth and one with Roche) are enough to give the player the two most radically different game experiences, but people like me can easily play the game through many more times, and think of the less obvious story changes as just as intriguing and fun. I'm still not tired of TW2, and I will most certainly start yet another playthrough once I'm done with my current TW1 run (using FCR for the first time and loving it).
Besides, two playthroughs are a lot more replayability than you usually get in modern games - not counting shameful achievement hunts that force you to play the game multiple times - so I don't think anyone really has any grounds to file a complaint in this regard, even though I obviously share your lust for wanting more, more, more! I'm literally giddy with anticipation! :D
Post edited July 13, 2011 by Kindo