Delhi metro corporation is doing a great job. I’ve been using Metro since last two years. I’m a student and I don’t have any personal vehicle in Delhi, in fact thanks to Delhi metro I don’t even need any! I usually travel on the yellow line.
The metro gets really crowded sometimes but besides that I don’t find any other cons. The Delhi metro is completely air conditioned and takes less time than other means. Sometime’s one can face problems like facing stupid people who commit acts of nuisance but that’s common to all public transports. I recommend everybody to use metro.