Atmosphere
Don't confuse better graphics with being bright. Sure, Dark Souls has good graphics with a "dark" mood. But it's Forgotten Realms, not Hades.
As for DOS2 being too cutesy or whatever. There are bodies and body parts everywhere. At the entrance to Fort Joy an npc is forced to cut out her own tongue before being obliterated. There is a shakedown by thugs inside. A torture chamber inside the keep. It's not a bright and cheery atmosphere at all.
Characters
I was never into the whole vampire thing, so I can agree with you there. But some people really dig it; and they do exist in D&D, so there is room to play with it. And the characters in BG1 & 2 being more interesting than DOS2? Maybe? Probably? But will the characters in BG3 end up not being as good as BG1 & 2? We just don't know.
Dialogues
It's not a novel. There needs to be a certain level of curtness to the conversations. As for the quality of the voice acting and such as seen in the demo? I thought they did a great job.
Humor
Humor can and often does go wrong. So, yeah, minimize or eliminate it. With ya.
Gameplay/Animations
The animations are fine overall. The jumping thing? Could be better, but nothing to get worked up over. It's really a petty detail.
Four party members? No big deal at all with DOS2. How will it work with D&D rules? Can't really say, but are you saying the only viable D&D party is a party of six or more? I doubt it.
General thoughts
Similar beginning is lame, I agree. But again, nothing to get worked up over. You move past it quickly enough. It's what follows that matters more.
Over the top feeling? I don't know what you mean.
Origin stories only add some depth. Most games give you one background (like BG did) or none at all. I don't see the problem.
think deeply what Baldurs Gate is
Unless you are just summarizing what you have so far written, what "Baldurs Gate is" is too subjective.
All in all, though, I appreciate you trying to be thorough in explaining how you feel.
