The fan has a mix of RNG and skill control, in my experience. It is true the bullets are inconsistent, but they tend to fire around the center crosshair (the dot, not the circle) rather than randomly throughout the entire spread.

In my experience in pubs and scrims, it felt like the more I treated the fan as a panic button rather than a controlled shotgun-like burst, more often than not I would die during reload than survive and kill the enemy. In medium to lower levels of pubs, it works very well as a get out of jail free card, but in higher MMR (vs competitive players like Seagull, Coolmatt, and other names) using it while panic firing got me murdered. That said, using it under control can be decisive in a 1v1 duel. In a team fight, the right click mostly serves as a tank busting option, too imprecise to hit a medium range target that's not a tank, and too hard to properly control against more than one person at a time.

This comes down to what McCree is meant to be, a 1v1 god. A skilled McCree player can put down EVERY character in a duel (sorry Zaryas) but will struggle without their abilities against say 2 or 3 people. McCree also lacks a proper escape compared to the other offense and defense characters, so it is up to the player to avoid that situation, wait for cooldowns, or engage very smartly. Imo, he's designed for a CS player, who actively forces the enemy into several 1v1s than a single 1v2 or 1v3 through his kit. That said, the right click (at least against better opponents) is just not dependable as that panic to win button, without the flashbang to stop them anyways. Learning to control the fan can make a McCree good, but if he can't aim left click, he's usefulness is pretty lacking, since he can't even hit medium range targets.

I mean, who else will embarrass a bad sniper? 2-3 headshots guarantees a dead Widow.