Even though what you said applies to most of the cases and casino games, I would like to point out that to me poker and other card games are an exception. Because I have seen some TV programs which show the life and strategies of professional poker players.
To me there is a skill component and also a psychological component on poker, which can be exploited by someone who is very good at reading people's cues and expressions, in order to multiply their chances of success, there is human interaction in card games. With dices, plinko and video poker there is no interaction.
This is true if you are a very skilled poker player which can dominate other players. Poker is a competition type game which you will experience a lot of losses than luck based game if you are playing against poker player that is far more skilled than you.
Those poker player that become successful on this field are all exceptional and not all poker player have same game result since this game is PVP. A player win if other player lose. This way, a mediocre poker player can be on consistent lose side.