The problem with truffle oil is that it smells like gasoline, not that it's synthetic. It smells nothing like truffles. And it can't be made any better since the compounds that give truffles their complex signature are not soluble in oil.

There's a resemblance between rubbing alcohol filtered through bread and bourbon, just like there's a resemblance between truffle oil and real truffles, but the comparison is really apt. Even though there's some resemblance, it's nothing alike, and it's really bad.