More "fun" is entirely subjective... More control the vehicle is not. If you have ever road raced, it's fairly simple to grasp
Here is Jason Plato comparing a Cayman S 6mt vs PDK.. Notice which laps faster..
Not a huge fan of auto's on sports cars, but they have came along way. I would no longer call them slush boxes for sure.
I will agree in F1 the sheer amount of sensors involved in driving and technology involved in those gearboxes will lend its self to faster laps with a sequential or auto of some sort box..
YouTube - Fifth Gear Cayman 6 Speed VS PDK
99.9999% of drivers are not going to be able to coax a manual box to beat a pdk esque box let alone a auto box around the track faster to be fair