I just got done playing a round of the story mode in Overwatch 2, the mission is a lot like the Overwatch Archives PVE modes, but they are a lot more refined. You get to play Tracer, Lucio, Reinhardt or Mei to stop a giant flying Omnium (Omnic factory) that is launching troops against Rio de Janeiro. Enemies are more reactive to your team movements, and will quickly gain up any team member, who strays away from the group.
Throughout the mission you collect an item from a supply crate, which grants a temporary non-hero specific ability. This includes a deployable cylinder shield, corrosive grenades, and more. The ability is on a very long cooldown, but can be reused as long as it gets to you to hold it. When you get a new supply crate the new item will replace the ability. On PC, The item ability is bound to 4 by default. A majority of the mission objectives, consists of clearing out enemies in different areas throughout the story map. Players are going to need to pay attention, to their specific hero abilities and how they can easily stop enemies most effectively. For example, I played Mei, which made me the most effective projectile shooter amongst that roster, so I had to shoot at most of the flying omnics and use my freeze ability on the larger ones.
The pace of the missions are relatively fast, and the characters feel exactly the same. Overall, The flow of the game is very engaging, and should be a welcomed part of the overall franchise.