>stats comparable to Meganium, except it's a slow mixed attacker with pitiful physical defenses
>by the time it gains its ghost typing, everything in Alola is spamming Crunch, Sucker Punch, and other physical dark attacks
>too slow to fight back and it's lucky to even get a single hit off before it faints

At least Meganium had enough bulk, and even a bit more speed, to get up some helpful support moves before fainting. Decidueye was easily the biggest dead weight of any starter I've ever used. I don't even want to imagine how it is in PLA with that even worse stat distribution and defensive typing.