My first impression: awesome.
A bit of a deeper drill down:
I was a huge fan of Crank (2006), which is probably grounds for my liking of Crank 2. The easiest way to describe Crank 2, for me, is to say "It's like Crank all over again, but more excessive, trashy and inventive".
The plot of Crank: High Voltage picks up where Crank left off 3 years ago. Chev Chelios (Jason Statham), poisoned by a chinese synthetic by Ricky Verona (Jose Pablo Cantillo) after an intriguing plot to kill Triad leader Don Kim. After a day long chase through Los Angeles, Chev finally tracks down Ricky and the two nemesis face off in a mile high fall to the ground. With both main characters seemingly dead Crank: High Voltage takes off.
Mere seconds after the crash landing of Chev on an elderly woman's car, violently rebounding to the pavement, our hero is, literally, scraped off the street by a group of Triad grunts and tossed into the back of a van. In a series of blurred visions we realize Chev's heart is being taken out and replaced by an artificial unit. Without wanting to spoil the movie I'll digress:
Chev chases his heart through Los Angeles all day. During the chase he's reunited with his "Doc" and his girlfriend.
Excessive, hilarious action sequences make the movie what it is. A no-brain-required movie for Statham and action fans alike.
I'll conclude by recommending this movie. I've never laughed so hard during an action movie in my life.