This topic has been discussed at length before. Yes, it's true that in absolute terms, the T4R is not underpowered.

The problem is that it feels slow in ordinary driving due to a combination of issues. The engine's torque output in the 2,000-rpm range where it spends most of its time is weak, and the transmission's top gear is tall. On the highway, this means downshifts are required to maintain a constant speed on anything other than a level grade, and sometimes even on a level grade if there's a headwind.

The transmission is very reluctant to downshift without a deep stab of the throttle. While the gradual throttle programming may be useful when rock-crawling, it's frustrating when trying to get the vehicle to respond quickly (aftermarket devices such as Pedal Commander or Sprint Booster help address this).

I think most people disagree with your take on the engine sound at high revs. I, for one, avoid high RPMs at all cost. At anything over 3,000 RPM the engine sounds to me like a Cuisinart full of ball bearings.