Is it common in your country to complain about bad service?

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Here are my corrections for you:

In my country, Most of the people are complain about bad service that is common.

>> In my country, most people complain about bad service and that is common.
Many people are visited to the store, almost staff is very kind for customer.

>> Many people visit stores and almost all of the staff in the stores are very kind to customers.
So, many people are complaint the bad service.

>> So many people complain about bad service.