A printed rug works best in a room that needs a bit of personality without a full renovation, a rental living room with white walls you can't paint, a kid's bedroom, a hallway that's otherwise just a strip of beige carpet. If your furniture is already busy, a bold sofa, patterned curtains, art everywhere, think twice before adding a loud rug on top. You end up with a room that looks like it's arguing with itself, and nobody wins that argument, including the rug.
The best use I've seen is in a smaller space that needs one thing to look at, a studio apartment, a reading nook, a narrow entryway. Pattern draws the eye down instead of up, which is useful when the ceilings are low or the walls are doing nothing interesting. It also hides a lot. Crumbs, pet hair, the general wear of a room that gets used every day, all of that disappears into a busy print in a way a plain gray rug never quite manages. Seasonally they don't care much, they're not fading in a window the way a sofa fabric might, so you can leave one down through a full year without worrying about one side going pale.
Where it falls apart is scale and lighting. A tight geometric print can look sharp in a showroom photo and then genuinely dizzying once it's under your feet every morning before coffee. Large scale florals or busy medallions need a bit of visual breathing room around them, a few feet of plain floor or a low key sofa, or the whole room reads as noise. And printed rugs, especially the flatter woven ones, show wear in the print before they show wear in the pile, so a rug that gets dragged across by furniture or dog nails can look tired at the edges years before the backing gives out.
On delivery day, unroll it flat somewhere with good light before you decide it's wrong, because rugs photograph differently than they sit in a room, and colors that looked warm online can turn oddly cool under your actual bulbs. Check the backing for any rubber or latex coating, some of those have a smell for the first week that's worth airing out before it lives under a dining table. And run a hand over the pile to feel for any crushed patches from being rolled too tight in shipping, most relax out in a day or two under some weight, but not all of them.
A good one earns its keep in the small moment when a spill shows up as part of the pattern instead of a stain you have to explain.