I'll back that one up. That exact attitude is something I'm personally working on right now, mostly as a result of discovering how much it affects people's perception of my work and abilities.
Talking crap about your previous co-workers is a great way to waste interview time and convince someone you will be difficult to work with. You're in a job interview. This is best-foot-forward, "paint me a picture of how awesome you could be" time. Don't bitch about your last job, we aren't here to talk about that.
If the honest answer truly was "everyone else was incompetent", just talk about your role in the project. If everyone was really that terrible and you were really that good, you should have some awesome stories about how you helped keep things on track. Maybe the whole damn thing was a sinking ship, but you have to have done something to help keep it afloat. Tell those stories.
Anyone with half a brain will catch on that you're talking around a bad work environment. They'll appreciate your tact and file away a note that letting you talk to customers/sales/management/whoever may not be as horrible as it would with most engineers. That's a very good mark in your favor.