Worst city center/downtown you've been to?

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Cancún, Mexico -- not the hotel zone, the 'downtown' is awful, ugly and completely devoid of interest. Playa del Carmen's downtown is not all that much better but still less terrible than Cancún. Whatever downtown Cozumel is is also terrible and boring.

Las Vegas -- defined as the Fremont Street area. I realize it has some fans, but my friend and I absolutely loathed it. I think the in-your-face kitsch sensory overload killed me, after an awful bus ride through the sh**t parts of Vegas. Only stayed 20 minutes there before escaping.

Gatineau, Quebec -- somewhat unfair because Gatineau is an awkward city for many reasons, like that it's a geographically spread out amalgamation of several towns and part of the bigger Ottawa urban area, but a recent poll showed that half of the local population doesn't even know where the downtown is (Old Hull). Downtown Hull/Gatineau is pretty boring outside of a few places. The big federal government buildings from the 70s are ugly concrete towers, and with post-COVID WFH in the government, it's basically killed the local economy revolving around servicing daytime public employees. Local residents have long been neglected by bad politicians and planners who never saw it as more than a government office space for years, so it's been a food desert for years, with no grocery store in the area until one finally opens later this year. Still pretty poor and dreary in many places, but with more 'higher-end' new condos coming up, lots of talk of 'gentrification' and endless downtown revitalization strategies from the city (a lot of them stupid miracle schemes). Also in Quebec, Laval is often said to have no downtown but Laval is basically a giant suburb which was run by kleptocrats for decades.

Niagara Falls, Ontario -- what is formally defined as 'downtown Niagara Falls, Ontario' is actually a decaying, dilapidated street outside of the touristy area, close to the dreary train/bus stop, which seems to be slowly dying. Clifton Hill is kitsch sensory overload tourist trap hellhole, and the Fallsview area is poorly planned (built around the big hotels and casinos only, basically, with surrounding parking lots).

I could also mention Buffalo, NY (not bad but clearly has seen better days), Belleville, ON (boring), any number of smaller towns in Upstate NY (Plattsburgh, Ogdensburg etc) and Amman, Jordan (hellish). Downtown Ottawa doesn't belong on this list (not yet, at least) but it is rather boring, kinda tourist-trappy in parts and victim of a lot of missed opportunities and very poor urban planning decisions over decades by bureaucrats and mediocre shortsighted local politicians. Sadly kind of getting gradually worse too.