I grew up with this game. It’s one of my favorites of all time. The story is quite good, and there are so many different party/class configurations that will keep you coming back for more. There are a huge number of quests, a great deal of them with hours worth of content and multiple outcomes. Every class has their own unique quest chain, and there are numerous others for each side of the alignment spectrum. The game is hugely improved over Baldur’s Gate 1, and there are even a few small improvements here over BG: EE.
I like the additions that Beamdog made, but it’s worth noting that this game is still very, very buggy – especially in online multiplayer. Unfortunately, it seems like they’ve created more problems than they’ve fixed. It can be tolerated or worked around, but people who have the original and are thinking of upgrading to this should perhaps weigh their options. If you’re looking to play multiplayer, expect to see good old Biff the Understudy fairly often.
My personal favorite additions are the hugely reduced load times, auto-loot, and the conveniently organized/bulleted journal. I haven’t played around a lot with the new NPCs, but I like them a lot so far. Their romance options, however, seem incredibly superficial at present. There is now a same-sex option for both males and females respectively, so that’s nice, though both of these NPCs are unfortunately evil.