I like a bit from each game...
BG1, the wilderness exploration was great, but in BG2, the NPC interaction adds a whole different element...
Some bits of BG2 are a tedious (underwater city) and boring, but there are some bits that are much better than a lot of the area's in BG1. Uamr hills, Underdark, Bodhi's lair, the Asylum...
I pretty much only play BG1, and BG2
although I have played Fallout 2, which is sort of an RPG
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"Watch your back" -
Sylent
Master Thief of the OHF