Poker is a fascinating game for one reason only: the cards you are dealt are only part of the strategy to winning.
It is true that in all card games, a good player can make a hand play better than it is. However, in poker, you can win with absolutely nothing in your hand, and you can manage to lose with the best hand at the table.
The cards are only part of the story; betting, bluffing, and reading your opponent matter just as much (or maybe even more) than the cards in your hand.
It is certainly true that a good poker player understands the chances of winning with the hand he was dealt. And with certain forms of poker, like Texas Hold’em, they understand in which ways they can be beat and the odds of that happening.