it depends on if you want to rank based on who's the best now or the whole year.
Currently though Navi is weak.
They lost to NIP of all teams.
They aren't anything special anymore.
I'd say the top 4 are pretty easy to figure out.
Outsiders (Tactically just better than other teams)
Heroic (Continually improving, might be above Outsiders by now)
Faze (More firepower and more structured than Liquid)
Liquid (More firepower and just above the rest of the teams).
After that it's nearly impossible to figure out.
Everyone is extremely weak looking at times, but at their best can absolutely win events (Like vita at EPL).