It is up to you. The thing is children are so different. Some are like going school while others don't. I sent my kids at age 2. At that time I also believed sending them off isn't good. But my child wanted to go since a neighbor girl was going. After that I sent him. Fortunately, the nursery I selected was suitable for him. They didn't try to teach letters, words like things at that age. They taught him how to to day to day things and social with other children. I saw a huge development of him because of that. He is now better than children in his age. Again it depends on the child as well.
At the end of the day, I think you have to examine the nursery and send the kid to a suitable place. Because I heard a lot of unqualified places also available, which don't know how to do the job correctly. It may do bad than good.