Well, the wheeld wasn't so much not well received as exploited to Hell and back by the humans - the planetary wheel was min-max heaven to some and figures like 1500 research per turn on one planet were attainable apparantly - as opposed to the AI who was cluelessly staring at the coloured round things. The humans complained "The dumb AI doesn't know how to use the damn wheels, Stardock! Fix it!" Brad replied "We know it doesn't because we quite deliberately have not written any AI for it. Be grateful it doesn't. You human min-maxers got nuthin' on an AI min-maxer!"
There were a couple of huge angry threads on the subject. Especially when it was removed. Lots of "you ruined my strategy of having 500 production per turn, you xxxxs!" people...