The BG series having the somewhat complicated AD&D rules didn't help those not literate in D&D. Personally after being introduced to 3.0 and 3.5 first, then going back to try AD&D is pretty tough (I finished BG and ToSC, and I'm working on BG2). Another alternative to the BG series is the Icewind Dale series (I didn't like the first one as much as Icewind Dale 2, but the 2nd one is difficult)
[edit] Hmm, now that I think about it IWD2 was pretty combat heavy, so if you like emphasis there, it's a positive.