I don't think you played enough... they become very natural over time.
I fully agree at first it's a shit storm given basically every button does something, but once you play for a bit it's no biggie.
Maynard - The WCS Guy
The controls are pretty good after a time playing the game, the inventory imo could have been improved (I have lost several guns trying to place them in a backpack) but once you know the various buttons and can aim the mouse in the right place it gets quite fluent.