McCree is the most overpowered right now due to his flashbang and double fanhammer combo which is not only useful for dealing with pesky Tracers, but can tear through Tanks. Widowmaker is also very useful for her wallhack Ultimate. Reinhardt I wouldn't call overpowered but is certainly the best tank for payload pushing, while Winston is great for Control. Lucio is a great support character for his speed boost, and if you have a Mercy to make up for his weaknesses you can have a potent combo so long as you have enough damage output on your team. Underpowered... DVa is useless and just gives the enemy team free Ultimate charge since she's a massive target with no decent shielding and a terrible Ultimate ability. Bastion and Torbjorn get shredded pretty quickly by a co-ordinated team. Zenyatta can be great with his Discord orb if he's on a good team and played by someone with amazing aim, but I feel he has too little health and his heal is a bit weak to be a main support and Lucio is a better off-support. Junkrat can be good but he can also be a huge hindrance if he's just giving the enemy team free Ultimate with his grenade spam, definitely switch off Junkrat if the enemy has a hero like Pharah that can't be hit. The heroes I feel are in a good place right now, where you're not stupid to pick them (so long as you have the rest of your team playing Lucio, Mercy, Reinhardt, and at least one McCree) are Zarya (great for her Ultimate combo potential and can do tons of damage if played well), Roadhog (good for picking off players with his hook), Pharah (good for taking out Junkrats, Zaryas and her Ultimate is great), Reaper (good Ultimate and good flanker), Tracer (can be great, if played well, to pick off enemy Supports or defence heroes), Genji (see Tracer but even harder to play well), Mei (can be good in 1v1 though McCree is better at her role I think), Symmetra (has her uses as an ambush hero and her Teleporter's great but definitely shouldn't be thought of as a Support, more a defence hero). Of course all of these are general, and the specific situation may favour certain heroes over others. For instance, DVa is pretty terrible, but you can do a 6x DVa strat on Attack on Hanamura and cycle through Defence Matrix, it can either be really effective or backfire something fierce. If you're new to the game, I would say try Reinhardt, Winston and Mercy. They're quite good heroes for newcomers to pick up and play (though they do take time to master). If you can learn to play as either you can fill a good role on your team. After that, for damage, learn how to play McCree, Pharah and Reaper. Lucio is also very useful to learn and have on your team. Learn not to "trickle" into the objective, you want to push as a group. And learn to focus Bastion and Torbjorn turrets (as well as Mercy, Zenyatta, Symmetra's Teleporter) when you see them. When you're confident you understand how the game works, then you can pick players like Tracer, Junkrat etc. And when your aim is solid you can pick Widowmaker (not Hanzo), Genji or Zenyatta.