I for one absolutely adore this show. One of the most interesting shows EVER made. I've literally watched the seasons TWICE now learning things that didn't realize the first time watched, and im still in love with the show. I love the whole multiple flashes, time travel, different worlds and the cast of this show knows how to act. On every earth the cast plays as a different personality or just plain changing their roles, such as in season 2 "Welcome to earth 2" Iris, Caitlyn, Cisco, Barry, ect. All change their characters personality or roles. Iris west-Allen becomes a detective just like her father joe west even though on earth 1 joe refused to let her join the force. Caitlyn and Cisco also become polar opposites of themselves, they both become evil (therefore introducing killer frost) while on earth 1 they are good guys. No character is left as a boring old helper or enemy to the flash/Barry Allen, everyone has their own problems and obstacles they have to overcome so that the show isn't just based on "The Flash" Everyones involved somehow. I also liked the way they made Iris and Barry go from childhood besties to adult lovers, fully support West-Allen.
Overall hands down, no doubt about it one of my favorite shows EVER. I believe you should totally watch it.