Unlike all the other reviews you'll see of the game, mine won't be negative. I'm not a veteran of the game, I haven't played the first Overwatch, and I've never followed any updates or news from Blizzard. I speak as an outsider to the game who's just playing it for the first time.
The game itself is nice, but there are many cons, which I'll list below:

First con: the game is absolutely unbalanced. There's too much difference in health between the various classes, and abilities can be useful or useless depending on certain situations. For example, if you play Tracer, you have three teleports and the "go back in time" ability to restore health, but since you're a character with 175 HP, it's impossible to do much if your weapons are "short-range" and therefore only effective up close. Death will be inevitable if you're up against characters that excel at melee combat like Reaper or others.

Second con: I don't think the game developers have fully grasped the role of the "Tank." A tank in any game must have a lot of health, perhaps a lot of stamina and abilities that stun, immobilize, or otherwise. It's impossible to assume that in every match the tank will have the most kills and the fewest deaths. You might think it's because of the healer, but that's not the case. Some tanks can easily take on half the team excluding the tank, without any problems, having short-range weapons like shotguns or the like. If we include the possibility of the healer having a brain, he will heal the tank without ever allowing it to die, making the game one-sided.

There would be other things to say, but they are not that relevant since they do not affect the gaming experience in a game, however I feel obliged to underline the fact that it is not a joke to say that the artists of Rule 34 and others care more about the game than the developers even if they use different ways to demonstrate it even if it does not seem to be a negative side, they know it, the players know it, the developers know it and you know firsthand that the 18+ side of the game is one of the cornerstones of the game and that no matter when or how, you will visit that side.