Been playing the game since the beginning of June and it's been a blast.
Right now, I love playing Reaper, Lucio, and Mercy; Reaper because his abilities and damage output are pretty ridiculous, and the latter two because healing the team is important. I also play some Junkrat as Demoman was my fav character in TF2, and Junkrat reminds me a lot of him.
Not sure who needs balancing right now, maybe Zenyatta and Bastion could use small buffs, but that's just what I think.
I'm personally fine with the amount of content in the game, and while I don't care for a story mode, I am down with the idea for an Overwatch movie.
"Just for comparison Uncharted 4 was 20x bigger than Splatoon 2. This shows the huge difference between Sony's first-party games and Nintendo's first-party games."