Just assessing strong/popular teams in no particular order.
NRG: crashies is one of the best initiators, and FNS is as far as I know one of the best IGLs as well. Honestly, I've always been a bit skeptical of Victor, but he was still a valuable part of OpTic so I won't count him out. S0M showed up really nicely at LOCK//IN and I can never forget ardiis' clutch against DRX. I'd at least consider NRG an NA superteam, if not a global one.
DRX: If Zest or Rb are the weakest links, then DRX has to be a superteam. stax and buzz are two of the best intiators/duelists, while I personally consider MaKo to be the best controller right now.
C9: Not even a question after yay left.
LOUD: All members of the team are equally valuable, in my opinion, and they're equal to the highest standard.
100T: Noteworthy members of Cryo and bang. I didn't see much from Cryo at LOCK//IN, but I think that's just because he was on Omen for whatever reason. bang is great, but not comparable to MaKo or Tuyz. But even if Cryo was Derke level or bang was MaKo level, Asuna, Stellar, and Derrek are not a "superteam" core.
FNATIC: Same assessment as LOUD.
SEN: Superteam on paper with core of pANcada, Sacy, and Zekken. Unlucky that they went up against FNATIC first, so I can't really assess them yet.