I was skeptical that the metagame would dramatically improve without Salamence but it definitely has for the time being. And it isn't even the fact that Salamence is so powerful and can rip through many "counters/checks" with draco meteor/dd outrage/fire blast/etc. It is that every style of play becomes more diverse and "better" without Salamence. Stall becomes very useful again, as Salamence was basically the number 1 Pokemon to defeat stall with (MixMence). Offense no longer has to dedicate a team slot to revenge killing DDMence because they would be swept otherwise (and there certainly were many chances for it to set up, such as choiced locked pursuit from ttar). Balanced teams that rely on Heatran/Water/Grass cores are now fully functional again, even teams like Hail can be used more effectively with MixMence (who can 2HKO everything) out of the picture.
This diversity makes gameplay a lot more fun, as new leads and less common sets are being seen to deal with what is popular, instead of having to center around dealing with Salamence. That screams over centralization, and the metagame has improved without it. Right now I am absolutely in love with CB Pert, who can really hurt stall teams with his bulk and power - I wouldn't even dream of using this Pokemon (which has Superpower/Waterfall/Earthquake) when Salamence was around. If that doesn't scream set up and OHKO everything, I don't know what does.
The game is also a bit more slow and makes you think, which I think is a wonderful thing. I don't need to add a Scizor to stop DD Mence or a Scarf Jirachi to try and speed tie. They are still good, but I can now use leftovers, expert belt, life orb, etc to make my opponent say "wait, what just happened?!". When multiple sets for Pokemon all become much more viable, I think this a clear sign that things have improved.
I don't really understand why people are hating "stall", most of the top players on leaderboard are using cool variations of offensive/balanced team that easily deal with it, and new sets are already hitting the ladder / becoming more popular. Stall is obviously better without Salamence gone, but as I said earlier, all other team types have improved as well, and so players should try to think outside the box when constructing your team, as the absolute biggest threat in the metagame is no longer there.