You should try out BG1. It is true that in many aspects BG2 is better, but BG1 most certainly has the better storyline. It's a shame you played BG2 before BG1, as I think the understanding of your character's being greatly enriches BG2.
As you can see by the many positive reactions, is is a good idea to try out BG1.
In the words of Accord:
Buy it!!
WELL WORTH YOUR MONEY!!!!
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The last arrow of Legolas kindled in the air as it flew,
and plunged burning into the heart of a great wolf-chieftain.
All the others fled. -J.R.R. Tolkien, The Lord of the Rings