Still enjoying this game, just went down south as a diplomat and am now investigating the night-killings and the plague. I expect my appreciation for Black Geyser will continue as long as I can (A) side with the rebels and kill the king, while also being able to (B) kill the patricide.
One weakness of this game vs BG1 is that the companions have a lot less personality. Also, I don't think there's as many of them, or at least they don't show up as soon and the party never feels as crowded. In BG1, right out the gate you had multiple choices that didn't mesh well together, so deciding who to let in was a real choice. Obviously the game wanted you to take Imoen, but the next two were clearly evil/insane and most people probably didn't want them. Then you wind up with the two "good guy" choices at the Friendly Arms Inn, and a quick trip south gives you another few options, with a lead on at least one more. So you've hit your party cap very quickly, some of the characters find each other disagreeable and/or have clear moral leanings that might disqualify them from your group, and so you have significant choices to make about your party composition.
In Black Geyser, though, you get the exact number needed to hit your party cap (Axeman, Tusk Cleric, Wizard Lady, and Thief). No more. Also, they seem totally ignore each other, lack any strong personality traits or opinions that would cause them to conflict with you, and basically there don't appear to be any real choices to make until much later in the game. I don't hate the characters per se, actually I think they show a lot of potential. They just need to be fleshed out more and there needs to be 3 or 4 more of them in the first chapter or two.