Toon & Team Power is often misleading, and is heavily influenced by Resistance, Crit Rate & Crit Damage. When you know that, you can look at the champions on a team and make a good guess on who will be tanky or who will be stacked with CR/CD.

However, speed is the most important stat because it determiens who goes first and speed does NOT factor heavily into power ratings.

Best advice for PVP is to build your TM Booster as fast as you can. 

And ignore team power because unless it's SUPER low or super high it's pretty meaningless

Honestly wish theyd just remove it from the game.  Doesn't add anything relevant. 

I do use it to gauge how much Res a team will have in higher end 3v3, and I'd actually like to see it in Live.  

Still somewhat viable to do that i guess but mythicals really throw teams out of whack. 

Yeah, as I mentioned somewhere else, my Cheshire Cat is *BADASS*, he can 1-shot most teams, has a power rating a little over 100k. My mikage is meh, needs a rebuild, but she's at 300k champ power

I believe it.  Also weird how much CD & res skew the numbers.

Those are certainly the two biggest contributors. Any chance, you know the full formula?