"Public transit service plays a considerable role in our life. The quality of these service are always being regarded as impoverished, second class, missed departure due to wrong real-time information, etc."
The entire sentence is grammatical but incomprehensible. At the very least it needs some punctuation. The list of qualities includes disparate terms that cannot sensibly be lumped together: "missed departure due to bad real-time information" refers to a particular type of incident, whereas "impoverished" or "second-class" refer to the service as a whole. You need to rephrase to clarify that you think the "missed departures" are part of what makes the bus service second-class and "impoverished".
Having said that, I would still suggest "poor" rather than "impoverished", unless you mean that a literal lack of funding is contributing to the poor quality of the service.