Excuse my ranting, and I'm sure you've heard this before, but this was a big part of why ToB sucked relative to SoA. ToB is just pure fight after fight, with revelatory lectures in between. And the customary pats on the back from Volo and Elminster. Your choices in the lecture do decide your epilogue, but that's a sop thrown towards roleplaying. I want to see the results in-game. Not being able to save Saradush was a sore point with me.
No sooner do I finish a ToB fight than I'm strategizing for the next. They're great battles, but it gets tiring eventually. In SoA, you could pick your battles and intersperse them with dialogue-based/easy-combat ones. These admittedly were Fedex rather than true diplomatic quests, but there was a semblance of change-of-pace that you, as a player, control.
In ToB, you could have visited another nation - Tethyr, for example, and convinced the Tethyrian army to aid Saradush. You could have negotiated treaties or made things worse - but no, the world is doomed to pain and suffering until you finally get that Throne of Blood. Even the only 'good' guy in the Five is after your ass, with no chance of an alliance. And Melissan plays you and the Five like a harp through the game, and there's nothing you can do about it, even as you deduce that she's not this Bhaalspawn savior, turning up like a bad penny everywhere you go. You can't play the Five against each other, can't help Gromnir against Yagashura. Bah. Throne of Bah is what it is.