Marriott Rewards just launched the ability to use Marriott Rewards points to book revenue flights and car rentals. This is outsourced to ezRez Software. I think that is always good to have more options to use points, although one Marriott point under this program is only valued at around $0.005 dollars. Marriott has a dedicated website for this: www.marriottrewardsairandcar.com.
Even Marriott fully discloses that using points for hotel rewards continues to be the best redemption option of Marriott points. I have always used my points for travel packages, however.