They seem to have 123 retractions across their whole editorial offer.

http://retractiondatabase.org/RetractionSearch.aspx#?jou%3df...

That's actually quite a good record for a publisher with 80 or so journals and ~270,000 published papers.

Edit: you're right @flobosg, I was looking at another comment with a similar username and my mind just squashed them together :P.