Well to be fair, a DnD 4th lvl 2ed was allmost a child which is not the case in 5th ed
The different ruleset was definitely one reason. Also, the fact that your party in BG2 didn't discover the Underdark until much later in the game, whereas in BG3 it's in Act 1. Your party members in BG2, are much higher in level as a result, leading to higher level enemies. The level cap in BG2 was also much higher than the level 12 in BG3.
I think the game design decision to have the Underdark in Chapter 1 in BG3 works out well, better than it would be if in later chapters. I'm currently in the Underdark and find it fun to explore and with a good balance of challenges for a level 4-5 party.
Really wish I could have a party of 6, I already have 5 companions and I dont want to drop any of them. Hopefully I can see all the companion side quests through in one playthrough.
I do miss having a party of 6, but I don't think it would work the way BG3 is designed. Partially because of combat balance, and partially because some areas you'll find yourself in can be kind of cramped, and fitting six people in might be a problem. Having only 4 makes it more challenging on knowing who to take, depending upon what situation you might be heading into.
I do think it will be possible to see through all the different companion quest lines if you talk to them all back at camp, as well as take them all out on your travels. Plus it's fun to hear how different combinations of them flirt, argue, and talk to each other. Getting their influence meters up to good levels will help too. Very similar to how Dragon Age Origins approached it.
Their questlines are simple either. I'm still only in chapter 1, but the each of their quests seem like it will stretch out of the entire game (or close to it). You uncover those quests and advance them in bits & pieces which is kept track of in your journal.
Did anyone take the Dark Urge? I'm guessing thats the reason so many are going evil according to the stats. I get the feeling I'll be playing through a few times over time with this one, so saved it for later.
No, I'm staying away from the Dark Urge in my first playthrough at least, mainly because I'm one of those good-type characters, and I want to see if there's any result from completely avoiding it. There's so many nuances and choices in this game that the replayability of this game is going to be huge.