I have lost over 8 series, Usually because despite doing my best, I get teams who either afk, dont care about working as a team, have tantrums and fee, or just otherwise decide to ruin peoples promos for laugh. They get some sick thrill out of "Oh? its your series? Ok, I am gonna feed"
It doesnt matter how well you try your best, because your team getts a sick laugh out of intentionally seeing you lose your series, and the other team will laugh about it. Why? because its not -their- promo being destroyed, so they will encourage the trolls, dismiss the afks, or just laugh in your face (in a manner of speaking) when you have intentional feeders.
Again, because, its not -THIER- promos/series being lost.
I have entered and lost my promos 8 times, due to these trolls, people who decide to go into ranked with "first time champs", to intentionally feed, or overall have a complete tantrum because they arent the best or a teammate is getting more kills than them.
League ranked is just a bunch of pathetic pre-school children who have a tantrum and rage when they dont get thier way.