Overwatch can be a minor-market game and somewhat niche while still being good. There's almost no chance that OW2 reaches the popularity and heights that OW1 did during its peaks, but it's still fairly healthy in an industry that's heavily oversaturated with live-service options. I think the game is in its best and most playable state in years. Similar to the game immediately after role queue. Where it's not as fun as it could be, it's not as addictive as it used to be, but the match quality is decent enough and gameplay is varied enough to make it a mostly good experience.
Essentially, Overwatch is able to be both a fiscal disappointment and fun at the same time. These things aren't mutually exclusive.