Of course but how to solve the problem if 2 ppl wanna play same role 

This is true, but in the long run, your skill will outweigh your luck.

Playing better does not guarantee you a win, but it will increase your odds at winning. Sometimes you play perfectly in a game, but your teammates took away that victory from you, and sometimes you play like shit, but got carried to victory by your teammates. Sadly most players only remember the former. Our ego will always try to deny our incompetence. We keep telling ourselves that there is no luck involved when we win a game, but when we lose it all happened because of bad luck.

Winning and losing a single pub game always involve luck, but luck has nothing to do with gaining mmr and improving yourself as a player. Just like in poker games, good players will win in the long run. 50 wins and 40 loss will still net you 100 mmr gain. One year ago i couldn't even pass the 5.6k mark no matter how hard i try, but recently I managed to increase 400 mmr, from 5.7k to 6.1k playing "random only " on my alternate account.

Anything is possible in dota life.

IIRC when I started playing DotA I began with Drow & VS. Thanks to Valve's tutorial, new players now start with Sniper.

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