A rating is a single number describing a business that isn't a single thing. The same kitchen, on a Tuesday at 6pm and a Saturday at 8pm, produces noticeably different evenings.
Once you notice this, you can use it.
Staffing. The senior chef usually works the busy nights. On slow nights you may get someone less experienced — or you may get the owner, personally, with time to care about your table. It cuts both ways.
Freshness. Kitchens receive deliveries on a schedule. Seafood especially is best early in the week at many places for exactly this reason, and Sunday night is when you're most likely to be eating something that's been sitting.
Attention. On a packed Saturday, your server has eight tables. On a quiet Tuesday, they have two. That difference is bigger than most differences between restaurants.
Who else is there. A place can be a relaxed neighborhood spot at 6pm and a loud bar scene at 10pm. Same address, different business.
Busy times get you the kitchen at its best and the service at its worst. Quiet times reverse it.
Most reviews mention when the visit happened, either explicitly or implicitly. "Saturday night was a zoo" and "we went for an early dinner midweek" describe different experiences of the same place.
When you're reading reviews, sort mentally by which ones match your plan. If you're going on a Tuesday at 6, the person furious about a 90-minute Saturday wait told you nothing relevant.
This resolves a lot of apparent contradictions. Places that seem wildly inconsistent are often just very different at different hours.
The bar chart showing how busy a place is by hour comes from actual location data, not from opinions. It's one of the most trustworthy things on a listing.
Read it for two things. First, whether you'll wait. Second, what kind of room you're walking into — a restaurant that peaks hard at 9pm on weekends is a different social experience from one that peaks at 6:30.
A place that's steadily busy across many hours is usually a genuine local staple. A place with one sharp spike is often destination dining or a bar.
Fast food, chains, and coffee shops are built for consistency. The whole operational model is producing the same thing regardless of hour, and they largely succeed. Don't overthink timing there beyond avoiding queues.
It matters most at independent restaurants with small kitchens, where one person's presence or absence genuinely changes the output.
MyTopRate's Open now only filter is useful for immediate decisions, but turn it off when planning ahead — otherwise you're hiding places that might be a much better fit for the time you're actually going.