It will take time to adjust and find balance to make the majority of the heros competitive. In any game there are cycles where some chars are good and some aren't and buffs/nerfs change that. Look at any moba game and you can see the swings of the top 10 heros shift with the patches but there's still 100 other heros that aren't considered as good overall or just fit specific comps/situations.
Problem is with this game... it isn't easy to max out chars and acquire enough resources to experiment. Most people are just watching what the whales and top 1-2% of players post as their comps or ideas and then copy it. That is why you see so much of the same. There are many chars that are useful and fit into weird teams that can destroy the current meta, but that information isn't shared as often.
As time goes on and people will have a lot more chars leveled and will have spare resources to start looking for new stuff or there will just be a cycle of the top % creating the meta and everyone else following. But all the copy people will forever be behind the curve.