During peak times, parking at the Marketplace can be difficult. It is always much easier to find a spot further down toward Planet Hollywood and the West Side. It doesn't take any time to walk up from there.
During busy periods, I try not to park near the Marketplace. I've had some horrible dents put in the side of my car parking in that lot. It is probably a combination of lots of small children and/or rental cars that people don't really care that much about. I've had more dents and dings put in my car parking at DTD's Marketplace over the past two years than I have ever had in all my years of driving (38 years). If you really care about your car, consider parking toward the West Side where you can park a little further back.