Shanghai Mahjong 22 pieces is not too big

According to the rules of Shanghai Mahjong, 22 pieces is not too big, as the self-drawn hand only costs 40 RMB per person and can be customized for different regions and play styles.

In addition, Shanghai Mahjong has other rules, such as the dealer's hand can be multiplied, the bottom score can be set, and so on.

So, whether Shanghai Mahjong 22 pieces is big or not needs to be judged according to the specific playing style and rules.