Now, I'm going to play devil's advocate here and say that I disagree with others views that the inventory and crafting system was annoying. The complication of the crafting system was part of enjoyment of the game - I.E. crafting things from things and other things, combining things together then making new things after crafting those things. I think it just pissed people off because instead of going down once and being able to come back with 12 or 15 different upgrades, you needed to combine so many things together and have "key" items so that only a few upgrades were available at a time.