[k-mcgrady]

I second this. I added 'AppiRater' (https://github.com/arashpayan/appirater) to one of my popular apps which users weren't reviewing. As soon as I added AppiRater the number of reviews increased a lot. I also noticed that it didn't increase the number of negative reviews which was a surprise.

[sumukh1]

If you do it right, then yes it will help your reviews. I suggest actually using iRate (https://github.com/nicklockwood/iRate)

The advantage of these libraries is that you can ask at a specific time, say the tenth launch.

[megablast]

As you can do with pirater. You can also set a time limit, a combination of both, remind the user again, or give them one change only. AppiRater is very flexible, not sure what iRate offers over that.