Is Weezing possibly gonna get an analysis now? It got Toxic Spikes, which is pretty awesome, and it handles physical Mega Lucario pretty well, in addition to completely walling special Landorus and providing a decent Fighting-type check overall (I'm looking at you Terrakion!). It handles Mega Aerodactyl, Excadrill, even CB Azumarill, non-Mega Gyarados, normal and Mega Tyranitar, Bisharp (it only takes ~58% from +2 Iron Head which is ridiculous and then it burns it), Trevenant, Scizor, and physical Aegislash well, and isn't 2HKOed by anything from even CB Talonflame. Its STAB Sludge Bomb lets it get around Sylveon/Azumarill/Togekiss, which is pretty nifty. This is just a list I threw together. If you guys are okay with, I'm reserving it.
Although I don't have much of an opinion on Weezing, just a heads up that Weezing does not wall Landorus-I very reliably because most Landorus these days carry Psychic as a coverage move due to the sheer presence of Mega Venusaur and Gengar. Also, Excadrill still completely fucks Weezing thanks to its Mold Breaker ability, and although it counters the Sand Rush variants, Mold Breaker is so much more common that I wouldn't really consider it a reliable check. And I'm not so sure if Toxic Spikes is enough to warrant it a set TBH. The common Mega Venusaur soaks up T-Spikes, Excadrill is immune to them and spins them away, and I'm pretty sure every user of Defog that is used in OU is immune to them as well. I'm not saying that T-Spikes aren't viable anymore, I'm just saying that they weren't always the best entry hazard, and now they're even harder to abuse because of how easy it is to remove them. Weezing itself does have its uses defensively though, but I haven't used in OU before, so I don't know how amazing it is.