I came here to say pretty much this, and I'm glad I didn't have to put the effort in to make it cohesive.
More specifically, this part
Things like Lickitung, Seed-sub Jumpluff, Cosmic Power users, etc. become literal win cards with very minimal strategy required. Lickitung especially, with it's heal bell/wish/seismic toss set, may as well have a move called "Skill issue" that uninstalls it's opponents client if they lack a fighting type. Basically anything with a health-recovery move is one mistake/bad-team-roll away from sweeping half-or-all of your team in a spectacularly snail-paced fashion. Stat boost sets with Nasty Plot, Quiver Dance, Swords Dance etc. help counteract these things, but present their own issues. If my matches don't go the way of "Well fug, his lead can super effective 5/6 of my team", or "Literally nothing I have can out damage it's heals", it goes the route of "hueuehuheuheue one quiver dance/nasty plot and I'm plowing through the whole team". Very few wins or losses felt like I really earned them, and I think moving the extreme offense/defense sets a little closer to the center balance would re-orientate gameplay towards strategy instead of team-rolls.
Recovery moves should be a tool to be used when you predict your opponent will switch out, not a tool to outstall any sets that can't do more than 50% damage without a crit.
Likewise, stat buffs should be less about sweeping an entire team of 100% health bars, and more-so a lategame strategy to apply after you've chipped your opponent down.
That said, randoms has been so phenomenally well balanced since the start, all things considered, that I'm honestly impressed at the results. The quirky sets and huge diversity between matches is phenomenal and keeps the gameplay fresh. I keep logging in because of the addition of this tier, which speaks to the fact that it's literally the greatest thing to be added to the game. After burning out due to 5k hours in Runescape, and 4k in Pmmo, I'm tired of the grind and like that I have the option to just play the game and chat with people.
#RandomsBestTier
Disclaimer: I've always been pissy about wall sets so take my complaints/criticism with a grain of salt. TLDR: skill issue