Gotta agree with enodenroH.
I will say this about how awesome BG is. The first time I played it, with zero AD&D experience whatsoever, I made it all the way to the end, but couldn't win. I'm just not that good at tactics/strategy in combat, and still wasn't that familiar with the AD&D system anyway.
So I just up and started over to make a stronger character (mage this time instead of paladin), and it did not bother me one bit. In fact, I'd say it made me happy because I now had another 40+ hours of gaming coming!
That time I got through and won. However, I had purchased TotSC thinking it was something you played after you finished the main campaign, which of course it was not.
So I started over AGAIN! (and this time for shits and giggles, I decided to play a female and only take female party members).
I played that game three times straight through and loved it each time, and unlike BG2 (or other cRPGs since), there's not a lot of variability available in each play through (the last time I did add in Dark Side of the Sword Coast for some extra fun, though I didn't care much for it).
I can not think of any game, before or since (and that includes BG2 which I've played probably a dozen times now), that I could play through 3 times in a row and love it every time.
Maybe it was just the lack of cRPGs I'd played (the last one had been U7
art 2, since I couldn't get U8 to run) and I needed a fix badly, but I don't think I've ever gotten as much out of one game in such a short time as I did with BG.