>>321233123
It's a lot more interesting. You discard tiles to build a hand, instead of praying your two dealt cards play into the three cards revealed.

Poker strategy is all about reading your opponents to judge what two they were dealt, and betting accordingly to minimize your loss as the next three are revealed; everyone's hands are decided at the time of dealing and cannot change.

Mahjong strategy is about discarding the right tiles to optimize your chances at building a winning hand, while reading everyone else's discards to avoid discarding tiles that they may then steal to use for their hand.