>>26500360They encouraged asymmetrical team-building and shook up the established meta game which was good as everything had stagnated into tier-whoring, item abuse, stalling, and spike shittery.
I personally don't use Megas anymore- and I beat many teams who use them in conjunction with Legendaries.
Pic related, Eeveelutions with the right abilities and moves are all you need. Mega Evolutions are actually very balanced because they lead a player to "commit" to relying on known abilities and stats alone. Items are superior in the sense that your opponent has to guess what you're holding until they see the effect.
In many ways, a team-based combo will always triumph over Megas.