I honestly don't like crafting in single-player RPGs. It just ends up cluttering the world and your inventory with a crapload of random ingredient items.
Oh yeah, I don't mind crafting QUESTS. That's perfectly cool. I just don't like systemic crafting.
Well, I was this close to write a long post on things that I like and don't like about crafting in RPGs and how BG2 stroke the perfect balance for me, but on second thought these two replies pretty much summarized my opinion on the topic.
P.S. Inventory clutter aside there's also another problem I have with elaborated systemic crafting: it's invariably either completely pointless or so overpowered that makes most of the game's loot across the adventure completely pointless.