Better to just rage about the new type and get over it than rage about how Venusaur and Volcarona are sweeping people's teams left and right in Sun, and how Tentacruel/Toxicroak/Polioed/Jolt are the pokes you're most likely going to see in rain, and that Hippo/Tar/Gliscor/Chomp/Jirachi/Skarmory are going to be the Pokemon you're going to see most in sand.
The general point is...the metagame, at this point, is just boring and extremely repetitive. Back in 4th gen, the only weather you really had to worry about was sand and that was because of the introduction of Gliscor and as well as (iirc) T-tar's 50% sanstorm boost to it's spdef, as well as Hippowdon. Rain was only a concern because of Starmie (who was like, a top tier threat iirc), but aside from that, I feel that a lot more strategy was used back in 4th gen competitive, because you won't have to worry about your opponent spamming weather anymore, really.
And it's not so much about introducing Weather killers anymore (though that would help, believe me). It's just introducing Pokemon with more variety. That's what the metagame is lacking. More diverse typing, more diverse abilities, more substance. Something to make OU less weather-based and actually centered around building a decent team and preparing for x threats and figuring out how to deal with it, kind of like how it was in Gen 4, what with most team's biggest threat at that point was prob LO (or Sash) Weavile.
As long as this generation introduces variety, I'm happy.