Trevor in a gunfight? He probably solos if he's in his rampage mode, and he has already literally stomped the shit out of Johnny.
Don't know about the races.
GTA V is better. GTA IV is a very good game, but has aged like a wrinkled old hag.
"To all visitors from Transylvania looking for the head of Voivode Dracula: Yes, we have it. Yes, he's dead. No, you cannot see it. No, he will not return and invade you again. It has been over thirty years, please stop pestering us."