It probably depends on the game. For instance, when there's a high house edge, especially in games like roulette, it's pretty much considered a luck-based game. That means you don't need skills to win; you just have to be lucky.
Now, if you're thinking about expecting consistent wins, well, I'd say that's a bit delusional and unrealistic. Just because you experience a win doesn't mean you'll win the next time. Most of the time, the house edge ends up being the winner, and we're not on that side.