Dani,
Broadly, at least ten criteria are used by customers in evaluating service quality as identified by many. So, a good MP must at least satisfies 6 or 7 of the criteria:
1.Reliability;
2.Responsiveness
3.Conmpetence
4.Courtesy
5.Credibility
6.Security
7.Access
8.Communication
9.Understanding the voters; and
10.Tangibles.
Have a memorable general election then!