How big is the area that's covered? Is it a type of little gravel rocks? That really doesn't sound very interesting.
Stray weeds coming up through plastic can be sprayed with weed killer every year....
Do you have an ultimate landscaping goal in mind? Depending on how big the area is, and what you'd like to do with it, there could be lots of great ideas that would be more interesting that grey rocks.
If the area is kinda small, you could put down a brick patio that would make a nice spot for some lawn/picnic furniture. Just yesterday I saw a fabulous round brick patio made with red brick. I think the existing gravel could become part of the patio....
You could build in some raised beds for flowers or for a few tomato plants. Add some giant pots for planting flowers. Bring in a park bench. Put in a couple of well-chosen shrubs and some perennials. Add a shepherd's hook for a spot for a hanging basket of flowers... a sundial...
You could put lots of variety and beauty out there!
I think if you decide to put down landscaping fabric over the rock, and then mulch over that, you will have to keep adding more mulch as time goes on...in an ongoing cycle.