Is hydroformed tubing good?
According to wikipedia, hydroforming is a cost-effective way of shaping ductile metals such as aluminum, brass, low alloy steels, stainless steel into lightweight, structurally stiff and strong pieces.

In reality, most aluminium frames are made this way. They start with a simple round tube and form it in more suitable shapes. You wil have to look hard to find non-hydroformed frames.