My first frames came in a pack of six, thin black plastic, and I filled them with photos within an hour of getting home. Within a year, three had cracked at the corner and one wouldn't sit flat against the wall no matter how I hung it, and that's when I learned a frame is a piece of furniture, not a formality.
Where they go wrong is usually in the grouping, not the single frame. A wall of eight different styles and finishes competing for attention just reads as clutter, and a frame with a heavy ornate molding looks ridiculous next to a thin modern one unless you've done it on purpose and committed. Mixed metals on a shelf, gold next to brushed silver next to black, can work if the photos inside are doing something consistent, but mixed finishes and mixed moods together usually cancel each other out. I'd also steer them away from anywhere with real humidity, a bathroom with no fan, a kitchen near the stove, because moisture gets under the glass and warps the mat board faster than you'd think.
Pick one up before you buy it. A well made frame has weight to it, even the simple ones, because the wood or metal is solid rather than a thin veneer wrapped around something hollow. Check the corners where the molding meets, a good joint is mitered clean and glued tight with maybe a tiny pin for reinforcement, a bad one has a visible gap you can feel with a fingernail or a seam that's already lifting in the shop. The backing matters more than people expect, a cheap frame uses a flimsy cardboard that bows within months, while a better one has a proper MDF or wood back with sturdy clips or a dust cover sealed on. Glass versus acrylic depends on where it's going, glass for anything out of reach, acrylic if it's near a kid's room or anywhere it might get knocked, since it won't shatter into the actual photo.
Good ones age well, the wood might pick up a little more character at the edges, brass can dull into something nicer than when it started, and that's fine, that's not damage. What actually kills a frame is sun, a spot that gets strong afternoon light will fade a photo and yellow a mat within a couple of years, so rotate anything in a bright window. Dust with a dry cloth, keep damp cloths away from the joints, and tighten the back clips occasionally because they do loosen over time, especially if the frame gets moved around a lot.
This suits a home where the photos actually get swapped out now and then, not ones sealed behind glass and forgotten.