*Reviewing as a person with no experience in playing LoL, but enjoys watching the music videos on YouTube*
The combination of an amazing soundtrack and beautiful animation was phenomenal. The way the animation and casted voice-actors were able to portray the complexity of each character, their history and how it influenced their emotions, and the progression of each relationship left a deep impression.
Whilst some relationships (I believe) were missing certain links to show the strengthening of their bond, the different relationships made throughout the series in order to protect what they cherish, draws a sense of sympathy even to characters typically undeserving of such (for lack of better words) pity. Something that's rare in a series, and shows the level of overall depth taken to understand each perspective.
The series as a whole was well enjoyed with no recognizable plot holes or character inconsistencies. Riot Games and the producers of one the best animated series I’ve watched (top 3, I’m an anime fan), they should take great pride with this production. I highly recommend watching.