YESSS! Argentus, I knew deep down you'd come through! And yes, Professor Genki is the bomb, he's probably a SR character I wouldn't mind seeing in DOA. He's my inspiration that encourages me to go on occasional killing sprees, mainly for that one saying he always says...what was it?The FIRST game was a standard GTA clone.
The second third and fourth completely blow GTA out of the water in every department except graphics so you'll probably hate them XD.
The second one adds in trademark humor and some crazy stuff like missions to drive around in septic trucks spewing poo at everything and flurries and you can pile drive grannies on the streets or hijack bikers by drop kicking the drivers off and you can surf and handstand on moving vehicles (including planes!) And drive bikes up the sides of walls and there's a zombie mini game and its generally hilarious.
The THIRD game cranks up the humor to cartoon levels while putting the awesome into overdrive. Like one mission is to hijack an enemy cargo plane. You arrive in your own plane and dive out without a parachute onto the roof of the other plane, climb in shoot your way through guards until you find a sonic blaster gun that makes people explode and fight to the tanks in the hangar eventually blowing up the entire plane then climb into a tank as they fall and have a tank battle in free fall. Also falling are bio weapon gas canisters which hit the ground first so when you land you clmb out of the tank, look around to see zombies, you character says "fuck my life!" And gets back into the tank.
Some of the zombies are hilarious too like one will Chase you carrying a big gulp from a gas station and will stop chasing you to take a big drink from it before running after you again XD.
The fourth game is less GTA more Crackdown and opens with a parody of the movie Armageddon as you ride a missile while aerosmith plays and fall and land in the white house as you are now the president with Keith David as your vice president and then aliens attack complete with you in a turret as the enemies move in Space Invaders formation. Then you escape the Pleasant ville Matrix as Somewhere Love Will Find You by Journey plays and you drive a car as a tiger paws at you while you're all wtf why a tiger.
And then there's Mr Genki.
I could go on. Saints Row is goddamn glorious.