Nice, let's see how long they can keep the momentum.
I have played a few games, and while I am not good at it, it's still fun to play, specially with character like Jeff, where you can focus on healing instead of kills.
The best thing they did is make playing supports fun. Warlock literally needs to press one button to heal most of the team and keep them grouped up. Other than that, he's free to deal pure damage. Shark is insanely cute, needs to target people actively with the healing beam (unlike mercy or medic, who latch on and just heal) which also rewards positioning. The racoon has huge mobility and very high dps minigun if you can hit your shots.
Compared to healers in Overwatch, where they were mostly fodder if left alone? Huuuge improvement.
I haven't tried Warlock yet, will give him a try. Racoon is pretty good, though his healing isn't that great (at least that's what I felt), great as a secondary healer though.
Warlock has projectile rightclick burst damage and leftclick is hitscan. So to instakill lower health classes, rightclick charge to the face and immediately leftclick after. It does insane dmg. Warlock is great for healing, since his shift spreads damage across the entire team, and he heals the entire team too.