The sad reality in ranked games that i hoped it wouldn't be the case...
What i think which is super frustrating if you do love a character a lot even if you master him like no one there are a lot possiblities that you won't be able to carry with him if it isn't a hyper carry.
For example i'm a main Malphite you can carry games yes but you do not have a lot of impact in the game if your team doesn't group however there are characters that are hyper carries which can do the job alone and i think that most of the characters are disavantaged against those :
Yi, Brand, Yasuo, Camille, Irelia, Pyke, Kai'sa, Vlad, tryndamere, Zed and heimer.
Those characters can do the job others characters do way better. They are hyper carries and can easily recover team mistakes which is somehow unfair.
With malphite i had a pretty good win rate and always good scores... However because my character wasn't a hyper carry character i ended up loosing a lot of games because i was dependant a lot on my teamates...
Then i started to play brand supp... I carried easily games and went gold in a short amount of time with him...
So yes there are some characters which are way better than others at soloq and it is frustrating...
I wish i could use the characters i do like instead of those that are hyper carries...