As far as motorcycle games go, this one is by far the best one ever made.
Now, for Thrash mode, it's more like a free race thing where you just race for fun and not money and plus you can tweek the gameplay with the options like more cops which is insane but fun. For Multiplayer, there are 7 modes of play. The first is thrash mode which is the same as the single player one. Second is 1 Lap, which is just racing but on 5 special tracks only made for multiplayer which are pretty good. Third is 3 laps which is the same as the 1 lap race, just different number of laps and fourth is 7 laps which still the same as 1 lap, just different number of laps. Fifth is Ped hunt and what you do is run over pedestrians for points and when the first player finishes, the player with the highest point total wins. This is like Carmageddon but only with bikes. It's a fun and pretty hillarious mode, wrong but funny. Sixth is deathmatch and what you do is knock off other players off their bikes and the 1st player to reach seven points wins. It's pretty good but I prefer thrash mode because there's more people to knock off their bike. And last but not least, there's tag and what happends is the 1st player to three points wins. Crash 'It', Crashing anyone else makes them it. I really don't care for this mode at all. Out of all the multiplayer modes, I like this one the least.
Graphics: The graphics are done pretty well in my opinion, not the best in the world but they work for me. If you really wanna make them shine then I suggest you buy the expansion pak for it. Without it, the graphics are pretty decent.
Sound: Road Rash 64 has a pretty rockin' soundtrack especially since it's on a cartridge. There's songs such as "Mean Machine" by Sugar Ray,(which is my favorite by the way) ,
"Livin' Life" by CIV, and many more. The grunts of bikers getting hit are done pretty well as are the crashes. The sound of the police telling you to pull over is pretty funny actually. I laugh at those fools. Weapons swipes sound pretty good but I prefer hearing my bat cracking someones skull instead.
Replay Value: This is definetly a game you will come back to in like a few days or so. Whether it be for the single player mode or the multiplayer mode, you will definetly have a good time either way. This game never gets boring, to me anyways.