It’s not that fans necessarily think that that Multiplayer Online Battle Arena (MOBA) Pokemon game is going to stink. If there’s one thing that The Pokemon Company has proven time and again it’s that, more often than not, whenever they put out a new title, it’s usually very, very well executed.
People seem to have taken issue with the fact that the game is “overhyped.”
Pokemon Unite was unveiled in a ridiculously detailed 11-minute video livestream to generate excitement for the title. Some fans think that while a Pokemon game that allows for MOBA, cross-platform action between both Switch and mobile gamers is really cool, basically LoL but with Pokemon, there were a lot of longtime fans of the series who believe that Nintendo was gassing it up way too much.
It didn’t help either that prior to the event, Nintendo and the Pokemon Company were alerting fans that something absolutely tremendous was coming that would positively rock their worlds. When they discovered that all the 11-minute video presentation was, again, just Pokemon Unite and nothing else, no other titles, or peripherals, or other Pokemon-related news, people got seriously salty.
Source : https://www.distractify.com/p/pokemon-unite-backlash