you could give racing the rustler a shot, but i don't see it being competitive against trucks like the RC10T4.1 and losi XXXT and 22T.
but you can use the rustler as an introduction to racing. gain some experience, learn to tune for track conditions, learn to drive on a track. things like that. then once you have that experience and you're more informed about what works, whats favored and what's supported at that track then you can buy a new race truck.
as much as i dislike the rustler i say go for it. race it. you've got nothing to loose and everything to gain