Of course, there are caveats to the above example, like if you are close to Terror Level 3 anyway and City Builds aren't coming your way, or if you are planning on rushing to a Fear victory, etc. But I consider winning right before the first stage III Build to be the "sweet spot...
Iwd2 was fun for me just trying builds with a different system than BG. I did grow bored with it fairly quickly though due to the constant battles and no real storyline. I keep saying ill go back to it but haven't (I'm at the part where you go through the maze woods like six...