Why should I use ember js

I just came familiar with ember js and came to know that I have to build ember app and deploy the dist folder to my server. As I join new job and they were already using ember so I have to use it but I figured out some thing very bad. I wanted to share and ask for clarification.

1. It creates one large js file which was near 2MB and will increase as modules usage and features will increase.
2. As it is compiled to one file I cannot figure out which feature was broken and I have to look at it in the latest release or some thing like that.
3. While developing when I run the ember server it kills me when it is taking time.

Please let me know if you know some good points about ember also the bad points.

Thanks in Advance.