The site itself is boring - it's just a large open space with a small prayer area on the side. There is nothing about this mosque that is worth seeing except that it's a large open space and has been around for a long time.
To make matters worse, whereas you would expect a religious site to be welcoming, it was the complete opposite at Jama Masjid. Officially, admission is supposed to be free and you need to pay 200 INR if you want to use a camera. In reality, however, if you are not Indian or are not traveling with a large tour group, they will try to charge you 200 INR per person regardless of whether or not you have a camera. They will also deny that this fee is for a camera, and will claim that the "rules recently changed" and that everyone has to pay 200 INR to enter, which is obviously a lie.
They also purposely waste your time - if you first try to enter through gate 1 and refuse to pay, they will tell you to go to gate 2. They when you go to gate 2, they will tell you to go to gate 3, and so on.
I'd recommend skipping this site, there is nothing worthwhile to see.