I was definitely worried about my name being featured in the middle of absolute nonsense, but the experience has usually been good: very few of the journalists completely missed the mark. The "tone" didn't always match what I was trying to get across, but it was usually close to someone in the field's attitude.
There were some minor errors and a lot of them come from a surprising source: many journals believe it's unethical to show "copy" (the complete article) to a source--or sometimes anyone outside the newsroom. Some scientific terms have nuances that aren't immediately obvious to people outside the field. For example, mine distinguishes between "inhibition" of neural activity, which involves specific molecular mechanisms (GABA, mostly) and suppressing it, which could be anything. This distinction probably isn't obvious to even attentive "general" fact-checker.