you shouldn't really compare BG3 to BG2 yet. But as far as introductions go, the introduction of Irenicus and Imoen and dungeon crawl to the Promenade are head in shoulders above our brief jaunt through hell and all the vague Absolute stuff.
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At this stage, I'm not sure a "fair" comparison can be made. Even with potential plot holes of "but you were dead in BG 1", we still knew who these companions were. We had all the background information we needed, in the intro, to fall right back in "where we left off", even if it wasn't really where we left off. In this case, we're closer to what we had in BG 1 instead. We're learning who we are, and who the companions are, as we go. Gameplay mechanics aside, this is exactly the same situation we were in during the intro to BG 1. Sarevok wants to kill us, but why? Who is Sarevok? What's up with Naskell? All things that have parallels here, to one extent or another. The problem being, since this is EA, we're not going to get any satisfying answers. We are, after all, not getting enough of the game to have any chance at getting them. I'm not "blown away" by the current iteration, but, I didn't expect to be. I expected to get something along the lines of what we got, since it's literally for testing out things, and seeing what does and doesn't work. My interest is piqued, but that's about it, so far. I've made a conscious decision to avoid playing overmuch, because I don't want to burn out on it before release, and considering my history with the franchise, I really want to love it, but it's too early to tell, right now.