Ban or pick these guys to make life easy. They are very hard to deal with.
These guys are strong and reliable. Powerfule early game to assist in snowballing your team or snowballing yourself. Their best counters tend to be others in this tier or those in the God tier.
These are decent picks. They have a fair amount of counter picks and aren't huge threats without a lot of experience or practice. They work but there are stronger choices.
These are picks ou never really want to make. They either don't have reliable engages, lack hard CC, have weak early clears, or a combination of those. That isn't to say they don't or can't work, but they're not solid choices in most cases.