H3 underpowered?

An H2 will not satisfy the need for speed either. H2 and H3 road performance is very similar to many cheap economy cars and 4 cylinder SUV's (such as CRV, Element, Xb, Rav4, etc.), who's performance is also considered to be only adequate.

If you want fast SUV's (and don't care about offroad ability), there are plenty to choose from including Cayene, Range Rover Sport, FX, Rav4 V-6, new MDX, etc.