IMO, a good sequel doesnt have to change too much to be good, and is usually close enough to be called “more of the same.”.

A good sequel is good because of its similarities to the first. Otherwise you end up with Zelda 2, which is widely regarded as the worst of the Zelda games because it changed so much (outside of a small but very vocal minority that liked it). Many movie sequels also try to change too much and end up suffering because of it. Return to Oz was an interesting movie, but I wouldn’t ever call it as good as the original. Aliens and Terminator 2 are both similar enough to their respective originals while still having minor tweaks that led to a good follow up.

So in the sense of a sequel, Overwatch 2 isn’t the worst, but I think it changed too much from the original and suffers because of it. And Blizzards decision to overwrite the original obviously plays a big part in many people’s dislike of the game.