Only occasionally. There seems a trend amongst some of the younger UK based jazz musicians to add a vocal track or two that sound like a bid for a wider, R&B/Nu Soul/Rap audience (I understand the motive and have no problem with it). Sometimes they just jar a bit with the rest of the album. It's never a deal-breaker most often just a bit of a disappointment.
Mind you, as I type this I can't think of an example...
Turning the thread on its head, I love the vocal track on Jackie McLean's 'Bout Soul as a fine example of when it works well for me.