Pretty good. Mechagodzilla (Called Kiryu) is built around the excavated skeleton of Godzilla of 1954 and uses it's DNA to run the machine, and can move in a blur (It body slams Godzilla to prevent his destroying a hospital). Supreme weaponry as well.
Kiryu made a comeback in Tokyo SOS, I hear.
It's illogical, if you ask me. You've already got one monster destroying a city...so you build another? Seems then you get TWICE the damage.