Gmail is one of the best mail service. It is being used by many people. I am also using Gmail since a past few years.
I find Gmail to be the most user friendly mail service. Making an Gmail account is very easy just basic verifications needed. It is very easy to send and recieve mails via Gmail.
The main reason for Gmail being my most favourite mail service is that, they divide the recieved mails in three different sections namely, primary, promotional and social. General mails are recieved in primary section. All mails from social networking sites are received under social section. Promotional mails are recieved in promotional section.I am very satisfied using Gmail.