The game being set in different acts with no way for the player to track back, yeah that doesn't sound very exciting to me. And yeah I think the overall structures of BG 1 AND BG 2 are more interesting (and compared to modern RPG trends, refreshing) than what we saw in DOS 1 and DOS 2. But I dunno if I feel it's such a big deal, compared to the quality (or lack thereof) of the content inside these acts. A game can still be great with a really predictable, unflexible structure.
What's that about little number of NPCs?
