I'm a Pokemon fan in general, but I watched Detective Pikachu more because I was curious about what the highest grossing video game adaptation of all time was like (recently surpassed by the Sonic the Hedgehog movie) rather than any particular desire to see it. (Pokemon games aren't exactly renowned for their deep and compelling stories.) The film ended up being a series of set pieces without much plot connecting them, and although there are a few key Pokemon (namely PIkachu, Psyduck, Charizard, and Mewtwo), the IP isn't even really used particularly well in general. I wasn't a big fan of the movie's attempt at making the Pokemon look more realistic than cartoony, or the grimy aesthetic, both of which were a bit too reminiscent of the mega-flop that was the Super Mario Bros. movie. Overall the movie was pretty much entirely forgettable, and aside from being a Pokemon movie I suppose a large part of your enjoyment of it will also depend on how much you like Ryan Reynolds. Personally I grew bored of his shtick after the first few minutes of the first movie I saw him in (the first Deadpool movie, I think). The one plus for the movie is that it did get me more interested in trying out the game (released on 3DS) that it was based on. I've had it for a while, and hopefully I'll get to it before the announced Detective Pikachu game or film sequel comes out.